* Makefile.in ($(docdir)/gccint.info, gccint.dvi): Add additional
dependencies.
* doc/languages.texi, doc/sourcebuild.texi: New files.
* doc/configfiles.texi: Make a subsubsection. Update.
* doc/configterms.texi: Add @node. Remove warning that this isn't
instructions for building GCC.
* doc/makefile.texi: Make a subsection.
* doc/gccint.texi: Update.
From-SVN: r48731
Joseph Myers