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When we update gnulib using our "update-gnulib.sh" tool, it doesn't automatically update the list of M4 files present at gnulib/Makefile.in:aclocal_m4_deps. This patch extends the tool to do that. It also puts "aclocal_m4_deps" in its own file (a Makefile fragment), so that it's easier to update it programatically. Tested by generating the file and diff'ing the results against the current version of "aclocal_m4_deps". gdb/ChangeLog: 2018-09-04 Sergio Durigan Junior <sergiodj@redhat.com> Pedro Alves <palves@redhat.com> * gnulib/Makefile.in (aclocal_m4_deps): Move to "aclocal-m4-deps.mk". Include file here. $(srcdir)/aclocal.m4: Add "configure.ac". * gnulib/aclocal-m4-deps.mk: New file. * gnulib/update-gnulib.sh: Automatically update "aclocal-m4-deps.mk".