asan ld builds without detect_leaks=0

I found that building binutils with -fsanitize=address,undefined
results in much of the testsuite not being run.  The problem is that
running gcc results in linker plugin memory leaks which of course are
errors, so the testsuite sees this as lack of compiler support.

	* testsuite/lib/ld-lib.exp (run_host_noleak): New proc.
	(check_compiler_available, check_lto_available),
	(check_lto_fat_available, check_lto_shared_available),
	(check_ifunc_available, check_ifunc_attribute_available),
	(check_libdl_available, check_gnu2_tls_available),
	(compile_one_cc): Use run_host_noleak.
	* testsuite/config/default.exp (compiler_supports): Likewise.

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