Set LC_COLLATE rather than LANG to override collation.

On a system with LC_COLLATE=C, this takes precedence over a non-C LANG
the test tries to impose and the test fails.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@251131 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed