message: Fixed only use #include <alloca.h> on linux
diff: #include "util.h"
  #include "module.h"
  -#ifdef ISPC_IS_WINDOWS
  -#include <shlwapi.h>
  -#ifdef __MINGW32__
  -#include <malloc.h> // for alloca()
  -#endif
  -#else
  +
  +#ifdef ISPC_IS_LINUX
  #include <alloca.h>
  #include <unistd.h>
  -#endif
  -#include <stdio.h>
  -
  +#elif defined(ISPC_IS_WINDOWS)
  +#include <shlwapi.h>
  +#include <malloc.h>
  +#ifndef __MINGW32__
  +#define alloca _alloca
  +#endif // __MINGW32__
  +#endif // ISPC_IS_LINUX
  #include <ctype.h>
  #include <stdarg.h>
  #include <stdio.h>
  