Mention BEEBS in the copyright headers.

	* config/default.exp: Mention BEEBS in the header.
	* gcc.benchmarks/execute.exp: Likewise.
	* lib/c-torture.exp: Likewise.
	* lib/file-format.exp: Likewise.
	* lib/gcc-defs.exp: Likewise.
	* lib/gcc.exp: Likewise.
	* lib/prune.exp: Likewise.
	* lib/wrapper.exp: Likewise.
	* site.exp: Likewise.