Failed to build with thread-safe option set on Android

[sheldonrobinson]

Enabling thread-safe build results in compile error.

ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]

Missing functions are pthread_cancel and pthread_setcancelstate

Platform

• HDF5 version: develop
• OS and version: Windows 11 Pro
• Compiler and version: android-ndk-27c
• Build system: CMake 3.30.5
• Any configure options you specified: ONLY_SHARED_LIBS=ON HDF5_ENABLE_THREADSAFE=ON HDF5_BUILD_HL_LIB=ON HDF5_BUILD_CPP_LIB=ON ALLOW_UNSUPPORTED=ON
• MPI library and version (parallel HDF5): OFF

Additional context Add any other context about the problem here.

[sheldonrobinson]

Fixed found in #4986