grub2: drop obsolete change

* It has been fixed upstream

Signed-off-by: sbwml <[email protected]>

openwrt/scripts/05-fix-source.sh

@@ -6,9 +6,6 @@ curl -s $mirror/openwrt/patch/apk-tools/9999-hack-for-linux-pre-releases.patch >
 # libsodium - fix build with lto (GNU BUG - 89147)
 sed -i "/CONFIGURE_ARGS/i\TARGET_CFLAGS += -ffat-lto-objects\n" feeds/packages/libs/libsodium/Makefile
 
-# grub2 -  disable `gc-sections` flag
-sed -i '/PKG_BUILD_FLAGS/ s/$/ no-gc-sections/' package/boot/grub2/Makefile
-
 # haproxy - fix build with quictls
 sed -i '/USE_QUIC_OPENSSL_COMPAT/d' feeds/packages/net/haproxy/Makefile