gettext

4ae04980 - build: Improve handling of divergences between gnulib and gettext.

build: Improve handling of divergences between gnulib and gettext. * autogen.sh: Detect divergence also of gettext.m4, nls.m4, progtest.m4. When there is a divergence without a serial number bump, assume it's a copyright year update and copy the file from gnulib to gettext.