Log Message:
audio/taglib looks for atomic support in the following order: std
(c++11), boost, gcc, mac, win)

The Latest boost update have broken the boost atomic check so it succeeds
if boost is installed (even though not buildlinked)

Since pkgsrc has a minimum gcc version of 2.8, we can just add
CXXFLAGS+=  -std=c++11
and have taglib pickup the std atomics, which avoids the boost atomic detect
issue, and is arguably better anyway

bump pkgrevision