Port the following upstream commit:
https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/591/diffs?commit_id=0148a15da1616a868d71abe1b56e3f28cc79533c
This fixes the following build error on mips with GCC10:
CCLD libint10.la
buildroot/output/host/lib/gcc/mips64el-buildroot-linux-gnu/10.3.0/../../../../mips64el-buildroot-linux-gnu/bin/ld: .libs/helper_mem.o:(.bss+0x0): multiple definition of `IOPortBase'; .libs/helper_exec.o:(.bss+0x0): first defined here
Signed-off-by: Raphaël Mélotte <raphael.melotte@mind.be>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
