Create symlinks pointing to configurable system path.
<rdar://86476583>
Created attachment 447309 [details] Patch
Note that there are important steps to take when updating ANGLE. See https://trac.webkit.org/wiki/UpdatingANGLE
Created attachment 447313 [details] Patch wfixing a couple of typos
Patch 447309 does not build
Committed r287137 (?): <https://commits.webkit.org/r287137>