3.2 PATCH: Avoid hardcoded uses of pwd

[Rainer Orth]

Jonathan Lennox writes:

> Is setting PWDCMD already in the build documentation somewhere, or should it
> be added?

it isn't yet, but I'll come up with a patch for this.  Unfortunately, this
won't be complete until upstream packages (autoconf, automake, libtool)
have similar support (I'll look into this when I get the time) and GCC uses
those versions.

	Rainer