fix argument order for g_date_time_difference()
fix argument order for g_date_time_difference()

The names of the arguments in the header file was reversed.

Closes bug #630000

ieei/glib-old-android,dicer/android_external_glib,ieei/glib-old-android,dicer/android_external_glib,ieei/glib-old-android,ieei/glib-old-android,dicer/android_external_glib,dicer/android_external_glib,dicer/android_external_glib