[PATCH 17/22] Enable building libquadmath with Intel CET

[Jeff Law]

On 10/12/2017 02:34 PM, Tsimbalist, Igor V wrote:
> Enable building libquadmath with Intel CET options.
> 
> libquadmath/
> 	* Makefile.am: Update AM_CFLAGS.
> 	* Makefile.in: Regenerate:
> 	* acinclude.m4: Add enable.m4 and cet.m4.
> 	* configure: Regenerate.
> 	* configure.ac: Set CET_FLAGS. Update XCFLAGS.
> 

Same comments as the libcilkrts changes.

Jeff