Fix CXX11ABI builds with clang++

The intention of the `WITH_CXX11ABI` option is to allow the user to control toggle whether to compile against the CXX11ABI in libstdc++  (and whether to download a few specific CXX11ABI compatible mason packages as well).

This option is important if you are building binaries (like the node binaries) and you want to support a platform that is older and does not have a recent enough libstdc++ to support the CXX11ABI (like ubuntu:precise, centos6, etc).

But this was broken for clang++ builds due to the use of `MAKE_COMPILER_IS_GNUCXX`. That was preventing the correct flags from being set when using clang++ effectively making the option useless and resulting in the build defaulting to whatever the libstdc++-dev headers default is on the system (which varies per linux distribution based on how libstdc++-dev is packaged).

This fixes the problem by ensuring that clang++ builds still support toggling control over this option.

Note: clang++ > 3.9 supports targeting both the new CXX11ABI in libstdc++ (with `-D_GLIBCXX_USE_CXX11_ABI=1`) and targeting the old one (with `-D_GLIBCXX_USE_CXX11_ABI=0`).

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