Fix testing code accidentally committed
Stub out tool configuration for Darwin platform
Detect building with OSX/iOS as target
Move #include <pthread.h> to abaclade.hxx

Apparently some other file includes it for Linux, but that doesn’t happen
in OSX.
Support C++11 type traits in more places
Merge master into osx
Replace ::getenv() with std::getenv()
Merge master into osx
Merge branch osx