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.
PostGIS 2.0.x Formula

Closes #260.

Signed-off-by: Xiyue Deng <manphiz@gmail.com>
Add Version 5.10.1 of vtk.

Closes #248.

Signed-off-by: Xiyue Deng <manphiz@gmail.com>
gcc49 snapshot 20131103
automake112: fix audit warning
subversion17: fix audit warning
isl011: style
isl011: fix audit warning
hadoop: fix audit warning
bash-completion2: upstream patches to fix make completion

Fixes #146.
llvm{33,34}: disable stdlib checking.

* LLVM has option to build libc++, which confuses stdlib checking logic.

Closes #265.
Merge remote-tracking branch 'upstream/master'