Fixes another failing test to pass on BigEndian.
Initial patch by Robin Dapp.
Reviewed-on: https://github.com/dlang/dmd/pull/9684
gcc/testsuite/ChangeLog:
2019-04-24 Iain Buclaw <ibuclaw@gdcproject.org>
* gdc.test/README.gcc: New file.
From-SVN: r270536
