Fixed incorrect prototype for glXQueryExtensionsString()

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40647

src/video/x11/SDL_x11gl.c

@@ -441,7 +441,7 @@ int X11_GL_LoadLibrary(_THIS, const char* path)
 	this->gl_data->glXGetConfig =
 		(int (*)(Display *, XVisualInfo *, int, int *)) dlsym(handle, "glXGetConfig");
 	this->gl_data->glXQueryExtensionsString =
-		(const char (*)(Display *, int)) dlsym(handle, "glXQueryExtensionsString");
+		(const char *(*)(Display *, int)) dlsym(handle, "glXQueryExtensionsString");
 	
 	/* We don't compare below for this in case we're not using Mesa. */
 	this->gl_data->glXReleaseBuffersMESA =

src/video/x11/SDL_x11gl_c.h

@@ -77,7 +77,7 @@ struct SDL_PrivateGLData {
 	 ( Display* dpy,
 	   GLXDrawable drawable );
 
-    const char (*glXQueryExtensionsString)
+    const char *(*glXQueryExtensionsString)
 	    ( Display* dpy,
 	      int screen);