gcc: backport an upstream fix for extern vars with local weak definitions

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42962 3c298f89-4303-0410-b956-a3cf2f4a3e73
openssl: add ABI_VERSION to fix package rebuild issues (fixes #18169)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42963 3c298f89-4303-0410-b956-a3cf2f4a3e73