remove weird double spaces, remove /EXPORT from build.bat in favor of __declspec(dllexport)

code/win32/winmm.c

@@ -52,7 +52,7 @@ typedef struct {
 // ---------------------------------------------------------------------------
 
 // timeGetTime is the lightweight alternative to GetTickCount; both return
-// milliseconds since system start.  We forward to the kernel tick counter.
+// milliseconds since system start. We forward to the kernel tick counter.
 extern uint64_t SysGetTick(void);
 
 __declspec(dllexport) unsigned long timeGetTime(void) {