Allow building against system installed version of isa-l #1922
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I noticed that
make install
was rebuilding isa-l and some other things, so I tried to update the external project for isa-l to fix that, but also to allow building XRootD against isa-l which is already installed in/usr
. I also added an option to enable using the system version, which I left disabled by default so that it will keep the previous behavior of preferring the internal copy of isa-l.