Alex Richardson c1a3d7f206 Remove remaining uses of ${COMPILER_FEATURES:Mc++11}
All supported compilers have C++11 support so these checks can be replaced
with MK_CXX guards.
See also https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252759

PR:		252759
Reviewed By:	emaste
Differential Revision: https://reviews.freebsd.org/D28234
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