wine: remove redundant devel block
wine: simplify caveats
wine: remove another devel block
wine: style
Don't report llvm-gcc if it's actually clang
Remove unnecessary use of globals in compiler version methods
These should be integers
nginx: use optional dep for passenger
Split up unreadable conditional
Update comment about CLT

This was worded in a confusing way, and made an assumption about future
OS X versions that we don't know to be true.

Also, it's probably wrong to state that the CLT location is dependent on
the OS X version; surely there will be a newer CLT for 10.8 that gets
installed in the same location as on 10.9. But we don't know any better
yet.
Pull another unwieldy condition into a method
Existence of directory is implied by existence of executables
Extract bundle_path method from Xcode#prefix
Eliminate nested conditional
fix libgit2 home page 404

Closes #21372.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
Cache pkgutil results at the source
scsh: force stdenv when building stable
Extract bundle_path from XQuartz.version
Extract guess_system_version
Extract version_from_mdls