xgl:  Add xgl header changes for rev30 and 31.

Switched EnumerateLayer parameter order, added conditional definition
of xgl function prototypes, and prepended 'xgl' to all function
prototypes. This included fixes for bugs #13173 and #13180.
diff --git a/include/xglDbg.h b/include/xglDbg.h
index 77695a0..7a5728a 100644
--- a/include/xglDbg.h
+++ b/include/xglDbg.h
@@ -100,15 +100,15 @@
     XGL_VOID*            pUserData);
 
 // Debug functions
-typedef XGL_RESULT (XGLAPI *DbgSetValidationLevelType)(XGL_DEVICE device, XGL_VALIDATION_LEVEL validationLevel);
-typedef XGL_RESULT (XGLAPI *DbgRegisterMsgCallbackType)(XGL_DBG_MSG_CALLBACK_FUNCTION pfnMsgCallback, XGL_VOID* pUserData);
-typedef XGL_RESULT (XGLAPI *DbgUnregisterMsgCallbackType)(XGL_DBG_MSG_CALLBACK_FUNCTION pfnMsgCallback);
-typedef XGL_RESULT (XGLAPI *DbgSetMessageFilterType)(XGL_DEVICE device, XGL_INT msgCode, XGL_DBG_MSG_FILTER filter);
-typedef XGL_RESULT (XGLAPI *DbgSetObjectTagType)(XGL_BASE_OBJECT object, XGL_SIZE tagSize, const XGL_VOID* pTag);
-typedef XGL_RESULT (XGLAPI *DbgSetGlobalOptionType)(XGL_DBG_GLOBAL_OPTION dbgOption, XGL_SIZE dataSize, const XGL_VOID* pData);
-typedef XGL_RESULT (XGLAPI *DbgSetDeviceOptionType)(XGL_DEVICE device, XGL_DBG_DEVICE_OPTION dbgOption, XGL_SIZE dataSize, const XGL_VOID* pData);
-typedef XGL_VOID (XGLAPI *CmdDbgMarkerBeginType)(XGL_CMD_BUFFER cmdBuffer, const XGL_CHAR* pMarker);
-typedef XGL_VOID (XGLAPI *CmdDbgMarkerEndType)(XGL_CMD_BUFFER cmdBuffer);
+typedef XGL_RESULT (XGLAPI *xglDbgSetValidationLevelType)(XGL_DEVICE device, XGL_VALIDATION_LEVEL validationLevel);
+typedef XGL_RESULT (XGLAPI *xglDbgRegisterMsgCallbackType)(XGL_DBG_MSG_CALLBACK_FUNCTION pfnMsgCallback, XGL_VOID* pUserData);
+typedef XGL_RESULT (XGLAPI *xglDbgUnregisterMsgCallbackType)(XGL_DBG_MSG_CALLBACK_FUNCTION pfnMsgCallback);
+typedef XGL_RESULT (XGLAPI *xglDbgSetMessageFilterType)(XGL_DEVICE device, XGL_INT msgCode, XGL_DBG_MSG_FILTER filter);
+typedef XGL_RESULT (XGLAPI *xglDbgSetObjectTagType)(XGL_BASE_OBJECT object, XGL_SIZE tagSize, const XGL_VOID* pTag);
+typedef XGL_RESULT (XGLAPI *xglDbgSetGlobalOptionType)(XGL_DBG_GLOBAL_OPTION dbgOption, XGL_SIZE dataSize, const XGL_VOID* pData);
+typedef XGL_RESULT (XGLAPI *xglDbgSetDeviceOptionType)(XGL_DEVICE device, XGL_DBG_DEVICE_OPTION dbgOption, XGL_SIZE dataSize, const XGL_VOID* pData);
+typedef XGL_VOID (XGLAPI *xglCmdDbgMarkerBeginType)(XGL_CMD_BUFFER cmdBuffer, const XGL_CHAR* pMarker);
+typedef XGL_VOID (XGLAPI *xglCmdDbgMarkerEndType)(XGL_CMD_BUFFER cmdBuffer);
 
 XGL_RESULT XGLAPI xglDbgSetValidationLevel(
     XGL_DEVICE           device,