patch to allow users to use a custom Automake installation

[Bruno Haible]

Currently a user who has installed Automake in a location != /usr
has problems: The bootstrap.conf script fetches pkg.m4 from the
location where 'automake' is installed. But the distros only install
it in /usr/share/aclocal/pkg.m4.

It is particularly annoying that we cannot download the newest
pkg.m4 through wget (of a tarball or git repository), because the
pkg.m4 is the processed output of what can be found in the tarballs
and git repositories of the ***-****** package.

This patch alleviates the problem. Code taken from GNU grep, likely
from Jim Meyering.

0001-build-Try-harder-to-get-pkg.m4.patch
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