Automatic generation of make dependency rules

[David M. Warme]

GNU m4 developers,

Here are patches that Lorenzo Di Gregorio and I are submitting
for the long-needed capability for m4 to automatically generate
make dependency rules.

This version of the patch is for branch-1.4.

I have a stand-alone shell script that can be invoked as follows:

    test-m4-makedep.sh m4_executable_path

that tests all of the functionality of these features.  This
script is NOT part of this patch because I could not find any
simple way to incorporate it into the make procedure.  (These
same tests are done using autotest in my patch for master.)
If you know of a simple way to hook this script up in the
Makefiles, I will be happy to send in the script.  Otherwise
we can omit the regression tests on branches other than master.

David Warme

branch-1.4.patch
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