Support MinGW compiler about cake

Not to mention, you left out Cygwin, too.

[thradams]

Yes. I am using only gcc on linux and msvc on windows.
I will check clang and write instructions how to add new platforms.

Basically, we use the same compiler used to compile build.c to generate cake. (except emscripten)
The compiler/platform is detected at build.h using ifdefs and then at build.c the command line
is selected. You can try adding a new platform.

#if defined(_WIN32) && defined(_MSC_VER) && !defined(__clang__)
#define BUILD_WINDOWS
#define BUILD_WINDOWS_MSC
#define COMPILER_NAME "cl"
#define RUN ""
#elif defined(_WIN32) && defined(__clang__)
#define BUILD_WINDOWS
#define BUILD_WINDOWS_CLANG
#define RUN ""
#define COMPILER_NAME "clang"
#elif defined(__linux__) && defined(__clang__)
#define BUILD_LINUX
#define BUILD_LINUX_CLANG
#define COMPILER_NAME "clang"
#define RUN "./"
#elif defined(__linux__) && defined(__GNUC__)
#define BUILD_LINUX
#define BUILD_LINUX_GCC
#define COMPILER_NAME "gcc"
#define RUN "./"
#else
#error Unknown Platform/Compiler
#endif

Then at build.c we call the appropriated command line. For instance:

#ifdef BUILD_LINUX_CLANG
    system("clang "
           SOURCE_FILES " main.c "
#ifdef TEST
           "-DTEST"
#endif
           " -std=c17 "
           " -Wall "
           " -o " OUTPUT);
#endif