Don't remove /usr/lib and /lib from when passing to the linker [PR97304/104707]

Don't remove /usr/lib and /lib from when passing to the linker [PR97304/104707]

With newer ld, the default search library path does not include /usr/lib nor /lib
but the driver decides to not pass -L down to the link for these and then in some/most
cases libc is not found.
This code dates from at least 1992 and it is done in a way which is not safe and
does not make sense. So let's remove it.

Bootstrapped and tested on x86_64-linux-gnu (which defaults to being a multilib).

gcc/ChangeLog:

	PR driver/104707
	PR driver/97304

	* gcc.cc (is_directory): Don't not include /usr/lib and /lib
	for library directory pathes. Remove library argument.
	(add_to_obstack): Update call to is_directory.
	(driver_handle_option): Likewise.
	(spec_path): Likewise.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>