[patch] Change valid arguments for --with-default-libstdcxx-abi

[Jonathan Wakely]

I intend to commit this to trunk and the gcc-5-branch either today or
tomorrow.

I made a mistake in using "c++98" and "c++11" as the valid arguments
for the ABI configure option, because it confuses people into thinking
that it is affected by, or affects, the -std=c++11 option.  In fact
the ABI mode and -std standard mode are independent.

The inline namespace is called __cxx11, the ABI-tag is "cxx11" and the
controlling macro is _GLIBCXX_USE_CXX11_ABI so I think referring to
the ABI as "cxx11" might help distinguish it from the -std=c++11 mode.

This will require distros that are using the
--with-default-libstdcxx-abi option to change their build scripts,
because using c++98 (or similar) now gives an error:

checking for default std::string ABI to use... configure: error: Supported arguments for --with-default-libstdcxx-abi have changed, use "cxx11" or "cxx98"
Makefile:11390: recipe for target 'configure-target-libstdc++-v3' failed

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