re PR libquadmath/55821 (Release tarballs (unconditionally) install libquadmath.info when libquadmath is not supported)

	PR libquadmath/55821
	* Makefile.am: Conditionally define info_TEXINFOS and
	libquadmath_TEXINFOS.
	* Makefile.in: Regenerate.

From-SVN: r216027