* lib/gcc.exp (gcc_target_compile): Add support for random runtime
	* lib/g++.exp (g++_target_compile): Likewise.
	libraries.
	* gcc.dg/cilk-plus/cilk-plus.exp: Improve support for runtime
	libraries.  Remove debugging.
	* g++.dg/cilk-plus/cilk-plus.exp: Add support to find runtime
	libraries.  Remove -O0, redundant with default.

From-SVN: r204887