Add cxxstdlib_check method to request changing C++ stdlib checking.

* In certain cases, a C++ software may result in linking to a different
  and incompatible C++ standard library than its dependencies and still
  works fine because it is by design. Examples include GCC, which will
  bootstrap itself and self-host after finish.

* Add a cxxstdlib_check method to formula to request changing the C++
  standard library checking. Currently using "cxxstdlib_check :skip"
  will let a formula skip such checking. This should only be used on
  rare occasions and be very careful.

Closes #23687.
Fix regression in `brew deps`

The default mode is intended to display recursive dependencies, with the
`--1` flag to display only one level.
Remove intermediate exception in Formula#system

Now that ErrorDuringExecution is only raised in one place, we can just
raise the BuildError directly instead.
ffmpeg --devel 2.1
libmpd: move URL from SourceForge.

Tarballs have been removed from SourceForge and are now hosted directly by musicpd.org.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
mpdscribble: move URL from SourceForge.

Tarballs have been removed from SourceForge and are now hosted directly by musicpd.org.

Closes #23915.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
ledger: remove unneeded HEAD patch.

The patch has been pushed upstream, so it is not needed any longer.

Closes #23903.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
Android SDK 22.3

Closes #23920.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
Elixir 0.11.0

Closes #23918.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
Postgres-XC: add compatibility with OS X 10.9.

Closes #23919.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
Undocument --use-gcc and friends

These options are deprecated in favor of --cc=<compiler>, so there is no
need to continue advertising their existence.
Remove --use-gcc and friends from completion scripts
wine: update older clang warning
Move gtkglextmm to the boneyard

This software no longer builds against recent changes in glibmm. Its
git repository hasn't had a commit in over two years and a release in
over four.

Closes #21333.
Merge remote-tracking branch 'upstream/master'