open-mpi16: add to homebrew-versions.
Add more mirrors to GCC/LLVM dependencies.
ppl011: track correct tarball.
subversion17 1.7.13

* Update to latest 1.7 release to avoid unavailable mirrors.

Closes #240.
Closes #247.
erlang-r13: stop using float for version comparison
gcc*: refine sandbox logic.

* Migrate to use "--enable-version-specific-runtime-libs" for
  sandboxing.
* Rename man7 with version suffix.
* Rename rogue files with version suffix.
* Remove libffi stuff.
gcc{43,44}: remove multilib option.

* Building multilib is broken for these GCC versions on Darwin.
gcc49 snapshot 20131027
protobuf 2.4.1

Closes #244.

Signed-off-by: Xiyue Deng <manphiz@gmail.com>
imagemagick-ruby186: update URL and hash.

* Old link doesn't exist any more.
* Drop trailing empty line.

Closes #253.
subversion17: use serf resource.
python26 2.6.9

Closes #255.

Signed-off-by: Xiyue Deng <manphiz@gmail.com>
ruby186: fix compilation against newer OpenSSL

Fixes #258.
ruby182: fix compilation with newer OpenSSL

This is the same fix as ruby186; see #258.
ruby182: remove inaccurate caveats

Ruby 1.8.2 didn't come with rubygems.
gcc*: skip C++ stdlib checking.

* GCC boostraps itself, so it is OK to have incompatible C++ stdlib than
  its dependencies.
Add percona-server55

Closes #228.

Signed-off-by: Xiyue Deng <manphiz@gmail.com>
postgis15: mark as keg_only to avoid conflicts.
percona-server55: fix syntax.
percona-server55: fix formula name.