Commit: Running the linker testsuite with clang

 Commit: Running the linker testsuite with clang

	* testsuite/config/default.exp: If not already set then create the
	CCC_OVERRIDE_OPTIONS environment variable to help when running the
	testsuite with clang.
	* testsuite/ld-elf/pr22269-1.c: Add a missing return statement.
	* testsuite/ld-elfvers/vers.exp: Add checks to detect if files
	were built before attempting to copy them.