Fixes Windows build

[karllessard]

Windows build is broken since upgrading to TF2.10.1, the Windows TF build of libtensorflow_cc is broken itself, this adds a patch that solves the issue.

One problem remains with the CustomGradientTest though, which is only failing on Windows. The JNI code generated by JavaCPP crashes the JVM, so I've temporarily disable it (which also means that custom gradient creation is not supported in Windows until we find a fix for that).

[karllessard]

I'll merge this out right now as it fixes a broken build.

About the CustomGradientTest crashing in the JNI code, @saudet if you have chance to reenable it and check this out, that would be great.

Here's some traces:

---------------  T H R E A D  ---------------

Current thread (0x000002382b662000):  JavaThread "main" [_thread_in_native, id=5220, stack(0x00000045fcd00000,0x00000045fce00000)]

Stack: [0x00000045fcd00000,0x00000045fce00000],  sp=0x00000045fcdfac90,  free space=1003k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C  [jnitensorflow.dll+0x4c030]

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j  org.tensorflow.internal.c_api.NameMap.erase(Lorg/bytedeco/javacpp/BytePointer;)J+0
j  org.tensorflow.GraphOperationBuilder.finishDangerousGradient(Lorg/tensorflow/internal/c_api/TF_Graph;Lorg/tensorflow/internal/c_api/TF_OperationDescription;)Lorg/tensorflow/internal/c_api/TF_Operation;+36
j  org.tensorflow.GraphOperationBuilder.build()Lorg/tensorflow/GraphOperation;+34
j  org.tensorflow.GraphOperationBuilder.build()Lorg/tensorflow/Operation;+1
j  org.tensorflow.op.core.Constant.create(Lorg/tensorflow/op/Scope;Lorg/tensorflow/types/family/TType;)Lorg/tensorflow/op/core/Constant;+37
j  org.tensorflow.op.core.Constant.scalarOf(Lorg/tensorflow/op/Scope;F)Lorg/tensorflow/op/core/Constant;+7
j  org.tensorflow.op.Ops.constant(F)Lorg/tensorflow/op/core/Constant;+5
j  org.tensorflow.CustomGradientTest.lambda$testCustomGradient$1(Lorg/tensorflow/op/Ops;Lorg/tensorflow/op/nn/NthElement$Inputs;Ljava/util/List;)Ljava/util/List;+13
j  org.tensorflow.CustomGradientTest$$Lambda$394.call(Lorg/tensorflow/op/Ops;Lorg/tensorflow/op/RawOpInputs;Ljava/util/List;)Ljava/util/List;+6
j  org.tensorflow.op.TypedGradientAdapter.call(Lorg/tensorflow/internal/c_api/TF_Scope;Lorg/tensorflow/internal/c_api/NativeOperation;Lorg/tensorflow/internal/c_api/NativeOutputVector;Lorg/tensorflow/internal/c_api/NativeOutputVector;)Lorg/tensorflow/internal/c_api/NativeStatus;+125
v  ~StubRoutines::call_stub
j  org.tensorflow.internal.c_api.global.tensorflow.TF_AddGradientsWithPrefix(Lorg/tensorflow/internal/c_api/TF_Graph;Ljava/lang/String;Lorg/tensorflow/internal/c_api/TF_Output;ILorg/tensorflow/internal/c_api/TF_Output;ILorg/tensorflow/internal/c_api/TF_Output;Lorg/tensorflow/internal/c_api/TF_Status;Lorg/tensorflow/internal/c_api/TF_Output;)V+0
j  org.tensorflow.Graph.addGradients(Lorg/tensorflow/internal/c_api/TF_Graph;Ljava/lang/String;[Lorg/tensorflow/internal/c_api/TF_Operation;[I[Lorg/tensorflow/internal/c_api/TF_Operation;[I[Lorg/tensorflow/internal/c_api/TF_Operation;[I)[Ljava/lang/Object;+162
j  org.tensorflow.Graph.addGradients(Ljava/lang/String;[Lorg/tensorflow/Output;[Lorg/tensorflow/Output;[Lorg/tensorflow/Output;)[Lorg/tensorflow/Output;+221
j  org.tensorflow.Graph.addGradients(Lorg/tensorflow/Output;[Lorg/tensorflow/Output;)[Lorg/tensorflow/Output;+12
j  org.tensorflow.CustomGradientTest.testCustomGradient()V+101

The generated JNI code:

JNIEXPORT jlong JNICALL Java_org_tensorflow_internal_c_1api_NameMap_erase__Lorg_bytedeco_javacpp_BytePointer_2(JNIEnv* env, jobject obj, jobject arg0) {
    std::unordered_map<tensorflow::string,tensorflow::Node*>* ptr = (std::unordered_map<tensorflow::string,tensorflow::Node*>*)jlong_to_ptr(env->GetLongField(obj, JavaCPP_addressFID));
    if (ptr == NULL) {
        env->ThrowNew(JavaCPP_getClass(env, 7), "This pointer address is NULL.");
        return 0;
    }
    jlong position = env->GetLongField(obj, JavaCPP_positionFID);
    ptr += position;
    signed char* ptr0 = arg0 == NULL ? NULL : (signed char*)jlong_to_ptr(env->GetLongField(arg0, JavaCPP_addressFID));
    jlong size0 = arg0 == NULL ? 0 : env->GetLongField(arg0, JavaCPP_limitFID);
    void* owner0 = JavaCPP_getPointerOwner(env, arg0);
    jlong position0 = arg0 == NULL ? 0 : env->GetLongField(arg0, JavaCPP_positionFID);
    ptr0 += position0;
    size0 -= position0;
    StringAdapter< char > adapter0(ptr0, size0, owner0);
    jlong rarg = 0;
    jlong rval = ptr->erase((std::basic_string< char >&)adapter0);
    rarg = (jlong)rval;
    signed char* rptr0 = adapter0;
    jlong rsize0 = (jlong)adapter0.size;
    void* rowner0 = adapter0.owner;
    if (rptr0 != ptr0) {
        JavaCPP_initPointer(env, arg0, rptr0, rsize0, rowner0, &StringAdapter< char >::deallocate);
    } else {
        env->SetLongField(arg0, JavaCPP_limitFID, rsize0 + position0);
    }
    return rarg;
}

Also, this binding seems to receive a special treatment from our end: https://github.com/tensorflow/java/blob/455fc731ece7aba751e7ec7ee1cd06dff3a1bfe0/tensorflow-core/tensorflow-core-api/src/main/java/org/tensorflow/internal/c_api/presets/tensorflow.java#L391

[saudet]

I'm guessing TF_OperationName() returns an invalid pointer for some reason...