what is the point of bfd/doc/ header generation rules

[Mike Frysinger]

bfd/doc/ has a few curious files that i can't seem to find docs on or any
references to.  are they just uncommon maintainer-esque rules ?  or are
they obsolete things that i can delete ?

specifically, what is the point of:
$ cd bfd/doc/
$ make libbfd.h libcoff.h bfd.h
$ md5sum libbfd.h ../libbfd.h
a25736b8ccbbdb2659690ac2dff9f4b3  libbfd.h
a25736b8ccbbdb2659690ac2dff9f4b3  ../libbfd.h
$ md5sum libcoff.h ../libcoff.h
ab7d38de3e2d817fbef5e3686191f5f9  libcoff.h
ab7d38de3e2d817fbef5e3686191f5f9  ../libcoff.h
$ md5sum bfd.h ../bfd-in2.h
c2fc85e26895027d1c52b1fb5fe8378b  bfd.h
c2fc85e26895027d1c52b1fb5fe8378b  ../bfd-in2.h
-mike
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