Generalize the dcc_{r,x}_argv routines so they can be used to
transfer arbitrary array-of-strings tokens (useful for protocol
hacking experiments; no functional change).

Reviewed by Fergus Henderson.

add a new "--scan-includes" option to distcc which shows
which headers distcc would send to the remote machine in
pump mode, without actually compiling anything.

add a work-around for a spurious gcc warning.

Also, add a missing check for strdup() returning NULL.

(typically the only change is in the FSF street address).  Add Google
copyright line in some places it was missing.  Add GPLv2 notice to
avahi patches.

OKed by fergus

Also, fix the emacs var-setting line: it was missing a semicolon
before, which means the entire line was being ignored.

No contentful change.

Reviewed by fergus@google.com

lines.  Fixed up resulting mis-indented code I noticed (mostly in
files that used 8 space indents, or used 4-space and 8-space indents
in the same file (!)).  Added the emacs tab-var setting for all files,
not just some of them.

I also added in copyright notices for files I noticed that didn't have
them.  We'll want to do another pass-through to fix these up properly,
though.

I used the following perl snippet to check for mis-indented code after
converting tabs to whitespace:

  $ for i in *.{c,h}; do echo $i; perl -nle 'if ($indent > 0) {$sp=" " x $indent; /^$sp[^ ]/ && print "$.: $_"; $indent=0;}; if (/^( *).*{/ ) {$indent=length($1);} else {$indent=0;}' $i; done | less

It had false positives, but hopefully didn't miss anything.

Reviewed by klarlund@google.com

This is needed to build the Linux kernel.

Reviewers: Craig Silverstein

affects the way emacs users will see these files, when visiting them
in emacs.  In particular, tabs will show up as 4 spaces, which is
(clearly) the setting the original distcc author used when writing the
code.

We also set an emacs variable to never insert new tabs, but use spaces
instead.  This will help stop the problem we have now with mixed tabs
and spaces.  In a future cleanup, we may replace all tabs with 4
spaces, and make other whitespace improvements.

The final new variable set, is to set line-wrapping at 78 chars.
Personally, I would have made it more like 72, but some existing files
already had the 78 limit, so I just do that everywhere, to be
consistent.

Reviewed by fergus@google.com

happened to notice this was missing.

Tested by compiling (via 'make') on cygwin and ubuntu.

Reviewed by fergus@google.com