porting to hppa-ipl

[Jeff Bailey]

Hi!  I started working on the port to hppa-ipl and have run into three things:

1) Dependancy generation seems to skip out on files that don't exist. 
This means that in the Makefile, hello.c doesn't wind up depending on
grub_script.tab.h.  "make grub_script.tab.h" works fine, and then the
build can proceed.  Current ports work around this by defining _HEADERS
lines, apparently, but this dependancy should probalby be explicitely
declared somewhere, or this file should be forcibly generated.

2) When hacking on the build env, how do I force things to be
regenerated?  When I do "make conf/hppa-ipl.mk", it doesn't generate the
file for me.

3) The files for grub-emu and others seems to be copied into each file
in conf.  Should these be refactored out into common.mk?  It seems a
waste for me to just copy them into hppa-ipl for yet another time.

Tks,
Jeff Bailey

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 - Voltaire