Merge topic 'cxx98-features'

a36b957f Features: Add cxx_template_template_parameters.
Merge topic 'osx-init-early'

bbc358c3 Merge branch 'master' into osx-init-early
0cce556b Xcode: Use sysroot and deployment target to identify compiler
0200d0a9 OS X: Factor a Darwin-Initialize module out of Platform/Darwin
416761e3 Add platform-specific initialization step when enabling languages
Merge branch 'master' into next