More msvc compat

Signed-off-by: falkTX <falktx@falktx.com>

source/includes/CarlaDefines.h

@@ -324,5 +324,8 @@ typedef unsigned short int ushort;
 typedef unsigned int uint;
 typedef unsigned long int ulong;
 typedef unsigned long long int ulonglong;
+#ifdef _MSC_VER
+typedef SSIZE_T ssize_t;
+#endif
 
 #endif /* CARLA_DEFINES_H_INCLUDED */

source/utils/CarlaMutex.hpp

@@ -215,7 +215,9 @@ public:
 
         pthread_mutexattr_t mattr;
         pthread_mutexattr_init(&mattr);
+       #ifdef __GNUC__
         pthread_mutexattr_setprotocol(&mattr, PTHREAD_PRIO_INHERIT);
+       #endif
         pthread_mutexattr_settype(&mattr, PTHREAD_MUTEX_NORMAL);
         pthread_mutex_init(&fMutex, &mattr);
         pthread_mutexattr_destroy(&mattr);