[mutex] Prefer pthread over windows

https://github.com/harfbuzz/harfbuzz/issues/1728

src/hb-mutex.hh

diff --git a/src/hb-mutex.hh b/src/hb-mutex.hh
index a760e73..cbbfa26 100644
--- a/src/hb-mutex.hh
+++ b/src/hb-mutex.hh
@@ -48,6 +48,17 @@
 /* Defined externally, i.e. in config.h; must have typedef'ed hb_mutex_impl_t as well. */
 
 
+#elif !defined(HB_NO_MT) && (defined(HAVE_PTHREAD) || defined(__APPLE__))
+
+#include <pthread.h>
+typedef pthread_mutex_t hb_mutex_impl_t;
+#define HB_MUTEX_IMPL_INIT	PTHREAD_MUTEX_INITIALIZER
+#define hb_mutex_impl_init(M)	pthread_mutex_init (M, nullptr)
+#define hb_mutex_impl_lock(M)	pthread_mutex_lock (M)
+#define hb_mutex_impl_unlock(M)	pthread_mutex_unlock (M)
+#define hb_mutex_impl_finish(M)	pthread_mutex_destroy (M)
+
+
 #elif !defined(HB_NO_MT) && defined(_WIN32)
 
 #include <windows.h>
@@ -63,17 +74,6 @@
 #define hb_mutex_impl_finish(M)	DeleteCriticalSection (M)
 
 
-#elif !defined(HB_NO_MT) && (defined(HAVE_PTHREAD) || defined(__APPLE__))
-
-#include <pthread.h>
-typedef pthread_mutex_t hb_mutex_impl_t;
-#define HB_MUTEX_IMPL_INIT	PTHREAD_MUTEX_INITIALIZER
-#define hb_mutex_impl_init(M)	pthread_mutex_init (M, nullptr)
-#define hb_mutex_impl_lock(M)	pthread_mutex_lock (M)
-#define hb_mutex_impl_unlock(M)	pthread_mutex_unlock (M)
-#define hb_mutex_impl_finish(M)	pthread_mutex_destroy (M)
-
-
 #elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
 
 #if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD)