Formatting these files now depends on the recently designed
Texinfo conditionals: to format successfully, you must use very
recent versions (not yet distributed by FSF) of texinfo.tex and makeinfo.c.
The new Texinfo commands are @set, @clear, @ifset, @ifclear, and @value.
Recent texinfo-2 Beta distributions contained partial implementations.
texi2roff does not yet support these commands.
There are miscellaneous clean-ups to Makefile.in as well.
* gdb.texinfo, none.m4, h8.m4, gdbinv-s.m4.in: improve H8/300
conditionals; introduce a few generic switches that may be
useful for other cross-dev or dos-hosted configs.
* gdb.texinfo: fix typo in "info reg" description
