Bring in changes for GEKKO from upstream

deps/rcheevos/src/rc_compat.c

@@ -120,22 +120,24 @@ void rc_mutex_unlock(rc_mutex_t* mutex)
 
 void rc_mutex_init(rc_mutex_t* mutex)
 {
-  LWP_MutexInit(mutex, NULL);
+  /* LWP_MutexInit has the handle passed by reference */
+  /* Other LWP_Mutex* calls have the handle passed by value */
+  LWP_MutexInit(&mutex->handle, 1);
 }
 
 void rc_mutex_destroy(rc_mutex_t* mutex)
 {
-  LWP_MutexDestroy(mutex);
+  LWP_MutexDestroy(mutex->handle);
 }
 
 void rc_mutex_lock(rc_mutex_t* mutex)
 {
-  LWP_MutexLock(mutex);
+  LWP_MutexLock(mutex->handle);
 }
 
 void rc_mutex_unlock(rc_mutex_t* mutex)
 {
-  LWP_MutexUnlock(mutex);
+  LWP_MutexUnlock(mutex->handle);
 }
 
 #elif defined(_3DS)

deps/rcheevos/src/rc_compat.h

@@ -81,6 +81,11 @@ RC_BEGIN_C_DECLS
   typedef struct rc_mutex_t {
     void* handle; /* HANDLE is defined as "void*" */
   } rc_mutex_t;
+ #elif defined(GEKKO)
+  #include <ogcsys.h>
+  typedef struct rc_mutex_t {
+    mutex_t handle;
+  } rc_mutex_t;
  #elif defined(_3DS)
   #include <3ds/synchronization.h>
   typedef RecursiveLock rc_mutex_t;