Revert "Writability for /usr/local is no longer required"
Revert "Writability for /usr/local is no longer required"

This reverts commit 21acfc1c7e66babf112196812fdfcf442edf3a97.

This was reverted because we tried to leave /usr/local with root permissions, but
this caused problems for us. Sorry Rogue Amoeba. I'd suggest not installing your
App's tools into /usr/local. It's outside your App's domain, so you can't be sure
what will happen there.

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