mk: Add support for conditional compilation of parts of the tree with
partial RELRO when MKRELRO=full is set.

Currently the X server needs to be compiled with only partial RELRO
due to the way certa

mk: Add support for conditional compilation of parts of the tree with
partial RELRO when MKRELRO=full is set.

Currently the X server needs to be compiled with only partial RELRO
due to the way certain (but not all - it seems wsfb works with full
RELRO) graphics driver modules are loaded.

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Remove duplicate lines.

apply -fcommon here as well.

use -fcommon where necessary.

import the xorg-server 1.10 reach over tree as xorg-server.old.