avrdude 6.0.1

Closes #23037.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
xctool 0.1.13

Release info: https://github.com/facebook/xctool/releases/tag/v0.1.13

Closes #23016

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
gmp: remove broken 10.6 bottle.
macos: cleanup whitespace.
xcode: Xcode 5.0 is the latest on 10.8.
Add Xcode 5.0.1.

Closes #23040.
Fix install_name_tool path for keg_only formulae

* When a versioned keg_only formula installs the same set of executables
  or libraries as a unversioned formula that links to $HOMEBREW_PREFIX,
  install_name_tool will prefer to use the linked paths for files in
  keg_only formula.  This breaks software that should link to the
  keg_only formula but links to the unversioned one instead.
* Add an additional "options" parameter with keg_only field to specify
  the correct install path for keg_only formulae.