[Bug libstdc++/69703] char16_t conversions broken in filesystem::path

[schwab@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69703

--- Comment #6 from Andreas Schwab <schwab@linux-m68k.org> ---
The tests fail on m68k.

Output: 66855.exe:
/daten/aranym/gcc/gcc-20160420/libstdc++-v3/testsuite/22_locale/codecvt/codecvt_utf8_utf16/66855.cc:68:
void test02(): Assertion `buf[0] == utf16[0]' failed.
Output: 69703.exe:
/daten/aranym/gcc/gcc-20160420/libstdc++-v3/testsuite/22_locale/codecvt/codecvt_utf8/69703.cc:54:
void test02(): Assertion `in[0] == u'a'' failed.