a few minor gold notes

[Tom Tromey]

Ian> I'll take a look.  When did gcc start passing --build-id?

I hacked in a simple boolean option for --build-id.
This isn't right, since --build-id takes an optional argument (ugh),
but apparently the F8 gcc doesn't pass an argument.

This got me to the next problem, which is that config.guess looks at
ld --help output:

	ld_supported_targets=`cd /; LC_ALL=C ld --help 2>&1 \
			 | sed -ne '/supported targets:/!d
				    s/[ 	][ 	]*/ /g
				    s/.*supported targets: *//
				    s/ .*//
				    p'`

... and decides that my platform must be i686-pc-linux-gnuoldld.

I suppose it would be better to fix config.guess, though simpler to
just print config.guess is looking for.

Tom