Added missing log debug function

include/SDL_log.h

@@ -143,6 +143,11 @@ extern DECLSPEC void SDLCALL SDL_Log(const char *fmt, ...);
  */
 extern DECLSPEC void SDLCALL SDL_LogVerbose(int category, const char *fmt, ...);
 
+/**
+ *  \brief Log a message with SDL_LOG_PRIORITY_DEBUG
+ */
+extern DECLSPEC void SDLCALL SDL_LogDebug(int category, const char *fmt, ...);
+
 /**
  *  \brief Log a message with SDL_LOG_PRIORITY_INFO
  */

src/SDL_log.c

@@ -174,6 +174,16 @@ SDL_LogVerbose(int category, const char *fmt, ...)
     va_end(ap);
 }
 
+void
+SDL_LogDebug(int category, const char *fmt, ...)
+{
+    va_list ap;
+
+    va_start(ap, fmt);
+    SDL_LogMessageV(category, SDL_LOG_PRIORITY_DEBUG, fmt, ap);
+    va_end(ap);
+}
+
 void
 SDL_LogInfo(int category, const char *fmt, ...)
 {