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It's good practice anyway, and it seems to avoid this aclocal bug:

aclocal: installing 'm4/ax_require_defined.m4' from
'/home/mcatanzaro/src/jhbuild/install/share/aclocal/ax_require_defined.m4'
aclocal: error: too many loops
aclocal: Please contact <bug-automake@gnu.org>.
 at /usr/share/automake-1.15/Automake/Channels.pm line 662.
	Automake::Channels::msg("automake", "", "too many loops") called
at /usr/share/automake-1.15/Automake/ChannelDefs.pm line 212
	Automake::ChannelDefs::prog_error("too many loops") called at
/usr/bin/aclocal line 1188

which is caused by aclocal discovering after its first run that it needs
to copy even more macros to our source directory, trying to do so, and
failing on this assertion.

Signed-off-by: Trần Ngọc Quân <vnwildman@gmail.com>

fixes #766118