build (make): update symlinks for armclang

Update temporary soft links to Arm Compiler. This is temporary
workaround to allow the two hosts to run the same tests with different
versions of Arm Compiler as Open-CI doesn't currently support the
latest version 6.18.

Change-Id: I5b222cf6510c48b8ca288681ae839f592ad4e442
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
1 file changed