randr: unexport and document RRProviderInit()

Not used by any external drivers, so no need to keep it exported.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

randr/randrstr.h

@@ -677,9 +677,6 @@ RRConfigureOutputProperty(RROutputPtr output, Atom property,
 extern _X_EXPORT void
 RRProviderInitErrorValue(void);
 
-extern _X_EXPORT Bool
-RRProviderInit(void);
-
 extern _X_EXPORT RRProviderPtr
 RRProviderCreate(ScreenPtr pScreen, const char *name,
                  int nameLength);

randr/randrstr_priv.h

@@ -378,4 +378,11 @@ void RRPointerScreenConfigured(ScreenPtr pScreen);
  */
 void RRDeleteAllOutputProperties(RROutputPtr output);
 
+/*
+ * Initialize render provider resource type
+ *
+ * @return TRUE on success
+ */
+Bool RRProviderInit(void);
+
 #endif /* _XSERVER_RANDRSTR_PRIV_H_ */