Use /usr/include as std include in Xorg

package/xorg/xorg.mk

@@ -90,6 +90,7 @@ $(XORG_DIR)/.configured: $(XORG_DIR)/.unpacked
 	$(SED) 's:REPLACE_GCCINC_DIR:$(shell $(TARGET_CROSS)gcc -print-file-name=include):g' $(XORG_CF)
 	$(SED) 's:REPLACE_STAGING_DIR:$(STAGING_DIR):g' $(XORG_CF)
 	$(SED) 's:REPLACE_ARCH:$(ARCH):g' $(XORG_CF)
+	$(SED) 's:#define StdIncDir.*:#define StdIncDir $(STAGING_DIR)/usr/include:g' $(XORG_CF)
 	$(SED) 's:#define CcCmd.*:#define CcCmd $(TARGET_CROSS)gcc:g' $(XORG_CF)
 	$(SED) 's:#define RanlibCmd.*:#define RanlibCmd $(TARGET_CROSS)ranlib:g' $(XORG_CF)
 	$(SED) 's:#define LdCmd.*:#define LdCmd $(TARGET_CROSS)ld:g' $(XORG_CF)