Make the code buildable on MinGW.org (not mingw-w64) and MSYS1.

include/PR/ultratypes.h

@@ -38,7 +38,11 @@ typedef s32 ptrdiff_t;
 #else
 #include <stddef.h>
 #include <stdint.h>
+#if defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR)
+typedef long ssize_t;
+#else
 typedef ptrdiff_t ssize_t;
 #endif
+#endif
 
 #endif

include/ultra64.h

@@ -30,4 +30,10 @@
 #include <PR/libaudio.h>
 #include <PR/libultra.h>
 
+#if defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR)
+#include <string.h>
+#define bzero(b,len) (memset((b), '\0', (len)), (void) 0)
+#define bcopy(s1, s2, n) memmove((s2), (s1), (n))
+#endif
+
 #endif

src/pc/gfx/gfx_pc.c

@@ -153,7 +153,21 @@ static size_t buf_vbo_num_tris;
 static struct GfxWindowManagerAPI *gfx_wapi;
 static struct GfxRenderingAPI *gfx_rapi;
 
+#if defined(_WIN32) && !defined(__MINGW64_VERSION_MAJOR)
+#include <windows.h>
+#define CLOCK_MONOTONIC 0
+//https://stackoverflow.com/questions/5404277/porting-clock-gettime-to-windows
+struct timespec { long tv_sec; long tv_nsec; };    //header part
+int clock_gettime(int arg, struct timespec *spec)      //C-file part
+{  __int64 wintime; GetSystemTimeAsFileTime((FILETIME*)&wintime);
+   wintime      -=116444736000000000LL;  //1jan1601 to 1jan1970
+   spec->tv_sec  =wintime / 10000000LL;           //seconds
+   spec->tv_nsec =wintime % 10000000LL*100;      //nano-seconds
+   return 0;
+}
+#else
 #include <time.h>
+#endif
 static unsigned long get_time(void) {
     struct timespec ts;
     clock_gettime(CLOCK_MONOTONIC, &ts);

tools/utils.h

@@ -7,8 +7,9 @@
 
 // printing size_t varies by compiler
 #if defined(_MSC_VER) || defined(__MINGW32__)
+  #include <windows.h>
   #define SIZE_T_FORMAT "%Iu"
-  #define realpath(N,R) _fullpath((R),(N),_MAX_PATH)
+  #define realpath(N,R) _fullpath((R),(N),MAX_PATH)
 #else
   #define SIZE_T_FORMAT "%zu"
 #endif