nginx: add patch to fix compilation error on mips targets

Add patch to fix compilation error on mips targets. This was triggered
after enabling LTO. It was discovered that -fPIC is enabled on building
dynamic modules in CFLAGS but was missing on linking them. This patch
adds the missing -fPIC also on linking.

Fixes: 3b13b08a

 ("nginx: Fix compilation with LTO")
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>