Properly set the dependencies in the pkg-config file

The public API uses gio and gobject header, ensure that these are in the
list of Required pkg-config modules, otherwise they are added to
Required.private which is not OK.

libfprint/meson.build

@@ -204,6 +204,7 @@ deps = [
     enums_dep,
     gio_dep,
     glib_dep,
+    gobject_dep,
     gusb_dep,
     imaging_dep,
     mathlib_dep,
@@ -269,6 +270,7 @@ libfprint_dep = declare_dependency(link_with: libfprint,
         enums_dep,
         gio_dep,
         glib_dep,
+        gobject_dep,
         gusb_dep,
     ])
 
@@ -325,6 +327,7 @@ if get_option('introspection')
         link_with : libfprint,
         dependencies : [
             gio_dep,
+            gobject_dep,
             gusb_dep,
         ],
         includes : [