build: require libqmi 1.6.0

We were already requiring some features from 1.5.0 (dev version), so depend
on the stable 1.6.0 now that it's out.

configure.ac

@@ -222,7 +222,7 @@ AC_ARG_WITH(qmi, AS_HELP_STRING([--without-qmi], [Build without QMI support]), [
 AM_CONDITIONAL(WITH_QMI, test "x$with_qmi" = "xyes")
 case $with_qmi in
     yes)
-        PKG_CHECK_MODULES(QMI, [qmi-glib >= 1.5], [have_qmi=yes],[have_qmi=no])
+        PKG_CHECK_MODULES(QMI, [qmi-glib >= 1.6], [have_qmi=yes],[have_qmi=no])
         if test "x$have_qmi" = "xno"; then
             AC_MSG_ERROR([Couldn't find libqmi-glib. Install it, or otherwise configure using --without-qmi to disable QMI support.])
         else