Optimized inlining was disabled by default when gcc 4 was still
relatively new. By now, all gcc versions handle this well and there
seems to be no real reason to keep it x86-only.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
(backported from 1e8882585c)
(rebased patches)
Signed-off-by: Jo-Philipp Wich <jo@mein.io>