[patch] libstdc++/66855 ignore endianness in codecvt_utf8_utf16

[Jonathan Wakely]

This facet is not meant to pay attention to mode|little_endian, so
explicitly override the value to output with the target's native
endianness.

Tested powerpc64-linux and powerp64le-linux, committed to trunk.

I'll commit it to the gcc-5-branch after the 5.2 release.

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