gcc: revert an upstream patch that is causing a regression on powerpc

https://forum.openwrt.org/viewtopic.php?pid=232494#p232494

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40709 3c298f89-4303-0410-b956-a3cf2f4a3e73