Fix path appending and concatenating to work correctly for a leading
root-name. Check a new macro, SLASHSLASH_IS_ROOT_NAME, instead of making
the behaviour depend directly on __CYGWIN__.
* src/filesystem/std-path.cc (SLASHSLASH_IS_ROOT_NAME): New macro to
control whether interpret paths with two slashes as a root-name.
(path::operator/=(const path&)) [SLASHSLASH_IS_ROOT_NAME]: Add a
root-directory when appending to a root-name.
(path::_M_append(basic_string_view<value_type>))
[SLASHSLASH_IS_ROOT_NAME]: Likewise.
(path::operator/=(const path&)) [SLASHSLASH_IS_ROOT_NAME]: Likewise.
(path::_M_concat(basic_string_view<value_type>))
[SLASHSLASH_IS_ROOT_NAME]: Likewise.
(path::lexically_normal()) [SLASHSLASH_IS_ROOT_NAME]: Use += instead
of /= to add a root-directory to the result.
* testsuite/27_io/filesystem/path/decompose/root_directory.cc: Fix
expected result for Cygwin.
From-SVN: r267107
