The `_MSC_VER ` guard prevents rc.exe to compile some rc files

[viruscamp]

The _MSC_VER guard prevents rc.exe to compile some rc files

#ifndef _MSC_VER // [
#error "Use this header only with Microsoft Visual C++ compilers!"
#endif // _MSC_VER ]

for examples:

• libabc.h

  #include <stdint.h>
  #define LIBABC_VERSION "3.7.9"
  int use_abc();

• libabc.rc

  #include <libabc.h>
  #include <windows.h>
  \\
          VALUE "ProductVersion", LIBABC_VERSION
  \\