Convert to our own SRWLOCK type on Win32

src/win32/mingw-compat.h

@@ -24,8 +24,6 @@ GIT_INLINE(size_t) p_strnlen(const char *s, size_t maxlen) {
 	return end ? (size_t)(end - s) : maxlen;
 }
 
-typedef struct { void *Ptr; } SRWLOCK;
-
 #endif
 
 #endif /* INCLUDE_mingw_compat__ */

src/win32/pthread.c

@@ -146,7 +146,7 @@ int pthread_num_processors_np(void)
 
 static HINSTANCE win32_kernel32_dll;
 
-typedef void (WINAPI *win32_srwlock_fn)(SRWLOCK *);
+typedef void (WINAPI *win32_srwlock_fn)(GIT_SRWLOCK *);
 
 static win32_srwlock_fn win32_srwlock_initialize;
 static win32_srwlock_fn win32_srwlock_acquire_shared;

src/win32/pthread.h

@@ -25,9 +25,11 @@ typedef CRITICAL_SECTION pthread_mutex_t;
 typedef HANDLE pthread_t;
 typedef HANDLE pthread_cond_t;
 
+typedef struct { void *Ptr; } GIT_SRWLOCK;
+
 typedef struct {
 	union {
-		SRWLOCK srwl;
+		GIT_SRWLOCK srwl;
 		CRITICAL_SECTION csec;
 	} native;
 } pthread_rwlock_t;