--with and --enable to give paths

[Reuben Thomas]

I noticed a message from Alexandre Duret-Lutz recently (who ought to
know) that said: "--with and --enable are not supposed to be used to
specify paths, and the GNU Coding Standards explicitly prohibit this
abuse."

The GNU coding standards actually say "Do not use a ‘--with’ option to
specify the file name to use to find certain files. That is outside
the scope of what ‘--with’ options are for. " which is not quite about
paths, but I take the point.

I've removed --with-lua-includes and --with-lua-libraries from
ax_lua.m4 to comply. I suggest others do the same for their macros.
(The idea is that you should set CPPFLAGS and LDFLAGS in the configure
command-line instead.)

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