configure.ac: Require at least texinfo 4.4.

configure.ac: Require at least texinfo 4.4.

	* configure.ac: Require at least texinfo 4.4.
	* configure: Regenerate.

	* doc/install.texi (Tools/packages necessary for building GCC):
	Update required version of texinfo to at least 4.4.
	(Installing GCC: Building): Update required version of texinfo
	to at least 4.4.
	(Installing GCC: Final installation): Update required version
	of texi2dvi to at least 4.4.
	(Host/target specific installation notes for GCC): Update required
	version of texinfo to at least 4.4.

From-SVN: r107465