[Bug 194258] CSTD idiom doesn't exist for CXXFLAGS

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194258

--- Comment #1 from Dimitry Andric <dim at FreeBSD.org> ---
Since the standard names for C and C++ are different, you cannot really use the
CSTD variable.  I would suggest using CXXSTD, which is consistent with all the
other "CXX" prefixes.

The available options should probably be:
* c++98
* gnu++98
* c++03
* gnu++03
* c++0x
* gnu++0x
* c++11
* gnu++11
* c++1y
* gnu++1y
* c++14    (these are only available from clang 3.5 and higher)
* gnu++14

Although the usefulness of the 03, 0x and 1y 'standards' is debatable, at least
for the base system.  For ports, all of these should obviously be available.

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