message: Fix check for windows predefined macros in renderdoc_app.h
diff: #include <stdint.h>
  #endif
  -#if defined(WIN32)
  +#if defined(WIN32) || defined(__WIN32__) || defined(_WIN32) || defined(_MSC_VER)
  #define RENDERDOC_CC __cdecl
  #elif defined(__linux__)
  #define RENDERDOC_CC
  