FindGTK2: Move check for pangocairo in gtk module
FindGTK2: Detect gthread library
CMake Nightly Date Stamp
FindX11: Search in /opt/X11 for OS X 10.8 (#14232)

As of Mac OS X 10.8, X11 is no longer installed under /usr/X11, but
under /opt/X11.
Merge topic 'FindX11-OSX-10.8' into next

488d968 FindX11: Search in /opt/X11 for OS X 10.8 (#14232)
Merge topic 'FindGTK2-tweaks' into next

508e8ca FindGTK2: Detect gthread library
8dca8ce FindGTK2: Move check for pangocairo in gtk module
FindBoost: Clarify failure on missing 'static' libs (#14235)

When Boost_USE_STATIC_LIBS is ON we may complain that Boost libraries
cannot be found even when shared libraries are present.  Update the
error message to tell the user explicitly that we want static libraries.

Suggested-by: Laurence R. McGlashan <laurence.mcglashan@gmail.com>
Merge topic 'FindBoost-error-reason-static' into next

86cbd73 FindBoost: Clarify failure on missing 'static' libs (#14235)
7c61c73 CMake Nightly Date Stamp