Revert "Improve external drives detection"

This reverts commit a01ee5a7b0.

I didn't mean to bump the GLib requirement in the stable branch.

configure.ac

@@ -42,8 +42,8 @@ m4_define([gtk_binary_version], [3.0.0])
 
 # required versions of other packages
 m4_define([glib_required_major], [2])
-m4_define([glib_required_minor], [49])
-m4_define([glib_required_micro], [1])
+m4_define([glib_required_minor], [45])
+m4_define([glib_required_micro], [8])
 m4_define([glib_required_version],
           [glib_required_major.glib_required_minor.glib_required_micro])
 m4_define([glib_min_required_minor],

gtk/gtkplacessidebar.c

@@ -876,7 +876,9 @@ is_external_volume (GVolume *volume)
   is_external |= !id;
 
   if (drive)
-    is_external |= g_drive_is_removable (drive);
+    is_external |= g_drive_can_eject (drive) ||
+                   g_drive_is_media_removable (drive) ||
+                   g_drive_can_stop (drive);
 
   g_clear_object (&drive);
   g_free (id);

gtk/gtkplacesview.c

@@ -474,7 +474,9 @@ is_external_volume (GVolume *volume)
   is_external |= !id;
 
   if (drive)
-    is_external |= g_drive_is_removable (drive);
+    is_external |= g_drive_can_eject (drive) ||
+                   g_drive_is_media_removable (drive) ||
+                   g_drive_can_stop (drive);
 
   g_clear_object (&drive);
   g_free (id);