disable warnings as error in the gdb configuration (#5602)

SVN-Revision: 17064

toolchain/gdb/Makefile

@@ -24,6 +24,7 @@ define Host/Configure
 		--build=$(GNU_HOST_NAME) \
 		--host=$(GNU_HOST_NAME) \
 		--target=$(REAL_GNU_TARGET_NAME) \
+		--disable-werror \
 		$(DISABLE_NLS) \
 		--without-uiout \
 		--disable-tui --disable-gdbtk --without-x \