package/network-manager: add missing dependency on libglib2

package/network-manager: add missing dependency on libglib2

Commit 7643ab05de860011e749aa720c92d5de150bee0a
("package/network-manager: drop obsolete dependencies") was a bit too
brutal in its dependency removal, as it forgot that removing dbus-glib
as a dependency would make libglib2 no longer part of the dependencies
of network-manager.

However, network-manager does require libglib2. From configure.ac:

PKG_CHECK_MODULES(GLIB, [gio-unix-2.0 >= 2.37.6 gmodule-2.0],
                  [AC_SUBST(LOG_DRIVER, '$(top_srcdir)/build-aux/tap-driver.sh')
                   AC_SUBST(AM_TESTS_FD_REDIRECT, '--tap')],
                  [PKG_CHECK_MODULES(GLIB, gio-unix-2.0 >= 2.40 gmodule-2.0)
                   AC_SUBST(LOG_DRIVER, '$(top_srcdir)/build-aux/test-driver')])

So this commit re-adds libglib2 as a dependency, and propagates the
appropriate "depends on". Nothing selects BR2_PACKAGE_NETWORK_MANAGER,
so we don't have to propagate these additional "depends on" anywhere.

Fixes:

  http://autobuild.buildroot.net/results/2025b1bd721bb5c5fa6638ccf389d2fd8fd10339/
  https://bugs.busybox.net/show_bug.cgi?id=12326

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Lubomir Rintel <lkundrak@v3.sk>
Cc: Christian Stewart <christian@paral.in>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>