continuous integration

[Bruno Haible]

Hi Jim,

For diffutils, I've now set up a continuous integration:
https://gitlab.com/gnu-diffutils/ci-distcheck

If you want to co-maintain it with me, let me know your GitLab login name,
so that I can assign you the permissions.

While setting up this CI, I noticed two problems:

1) bootstrap.conf specifies that 'rsync' is needed. But rsync is not needed
any more by 'gnulib-tool' and by 'bootstrap' since 2018-10-07.
<https://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=commit;h=0ddd440d18af7bb10437642f12721d83092f0bea>

2) bootstrap fails with the error message

  ./bootstrap: Cannot find pkg.m4; perhaps you need to install pkg-config

But this is pointless, since nothing in the diffutils configuration needs
pkg-config. All dependencies (to libsigsegv, libiconv, libintl) are managed
through Autoconf macros from Gnulib.

Suggestion: Remove the need to have rsync and pkg-config attached when
building from git. Patch attached.

0001-build-Don-t-require-rsync-and-pkg-config-as-prerequi.patch
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