configure.ac: bump glib requirement to 2.31.7 for GSocketClientEvent
configure.ac: bump glib requirement to 2.31.7 for GSocketClientEvent

fanc999/libsoup,jwendell/libsoup,jwendell/libsoup,Distrotech/libsoup,Distrotech/libsoup,jwendell/libsoup,Distrotech/libsoup,Distrotech/libsoup,fanc999/libsoup,fanc999/libsoup,fanc999/libsoup,jwendell/libsoup,jwendell/libsoup,fanc999/libsoup,Distrotech/libsoup