[HACKERS] PSA: don't be in a hurry to update to XCode 9.0

It seems to install some libraries that depend on
/usr/lib/system/libsystem_darwin.dylib, which doesn't exist.
Googling suggests it will be there in macOS 10.13,
but on Sierra or earlier, you're outta luck.

It looks like the only directly-affected PG dependency is
libxml; if you leave out --with-libxml you can still build.

I found this out the hard way on longfin's host, so I've
temporarily removed --with-libxml from that animal's
configuration to restore it to service.  I trust I'll be
able to re-enable that after 10.13 comes out.
        regards, tom lane


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