[usb-moded] Check for glib using a prefix. Contributes to JB#51115

Check for glib using the prefix GLIB as required by dbus-gmain tests
to prepend the appropriate variable prefix in front cflags and libs.

Signed-off-by: Björn Bidar <bjorn.bidar@jolla.com>

configure.ac

@@ -98,6 +98,7 @@ AC_ARG_ENABLE([ofono], AS_HELP_STRING([--enable-ofono], [Enable ofono DBUS inter
 AM_CONDITIONAL([OFONO], [test x$ofono = xtrue])
 
 PKG_CHECK_MODULES([DBUS], dbus-1 >= 1.8)
+PKG_CHECK_MODULES([GLIB], glib-2.0 >= 2.24.0)
 PKG_CHECK_MODULES([USB_MODED], [
  glib-2.0 >= 2.24.0
  dbus-glib-1 >= 0.78