Modernize to automake 1.14.
* Makefile.am (AUTOMAKE_OPTIONS): Move to ... * configure.ac (AM_INIT_AUTOMAKE): here and add serial-tests. * keyserver/Makefile.am: Replace INCLUDES by AM_CPPFLAGS. * mpi/Makefile.am: Ditto. * util/Makefile.am: Ditto. * keyserver/Makefile.am: Ditto. Adjusted other things. * m4/intl.m4, m4/po.m4: Use autoconf's AC_PROG_MKDIR_P.