Link libstdc++ statically (avoid dependency)

Please merge after testing. Test builds can be found at einstein2:/tmp/eah_gfx_refresh_win64_static.zip

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• 3c7084c4 - Link static library directly as g++ option fails

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OK, ready to retest, should work now... Zip updated...

Let me check quickly if this is beneficial for macOS (or even Linux) as well before we merge...

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Ok, macOS ships with libstdc++ by default, so I don't think it's necessary link it statically. Also the approach used for MinGW doesn't work with clang (despite being available). Linux would work but is probably also not needed as it should be installed by default, I presume.

Note: libstdc++ has been deprecated by Apple and needs to be replaced by libc++ soon (not by this MR)!

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merged

mentioned in commit be11bd35