disable PIE when checking for PIC default

When the compiler builds PIEs by default, the configure PIC check is
confused into thinking PIC code is default.  The end result is that
we end up with only PIC being produced.

Run the configure check with -fno-PIE so that we produce PIC & non-PIC
(PIE) objects like normal.

2014-09-09  Kevin F. Quinn  <kevquinn@gentoo.org>

	* configure.ac (libc_cv_pic_default): Pass -fno-PIE.
	* configure: Regenerated.