gsignal: add g_signal_handlers_disconnect_by_data
gsignal: add g_signal_handlers_disconnect_by_data

Similar to g_signal_handlers_disconnect_by_func() but disconnects all
functions that use the given user_data.

https://bugzilla.gnome.org/show_bug.cgi?id=668269

iConsole/Console-OS_external_bluetooth_glib,djdeath/glib,justinkb/aosp-bluez.glib,endlessm/glib,darren-clark/android_platform_external_bluetooth_glib,ieei/glib,cention-sany/glib,tchakabam/glib,lukasz-skalski/glib,Distrotech/glib,krichter722/glib,johne53/MB3Glib,bluez-android/glib,cention-sany/glib,Distrotech/glib,tamaskenez/glib,endlessm/glib,krichter722/glib,cosimoc/glib,MathieuDuponchelle/glib,tchakabam/glib,mzabaluev/glib,iConsole/Console-OS_external_bluetooth_glib,mzabaluev/glib,gale320/glib,cosimoc/glib,justinkb/aosp-bluez.glib,tamaskenez/glib,Distrotech/glib,johne53/MB3Glib,pstglia/platform-external-bluetooth-glib,cention-sany/glib,mzabaluev/glib,tchakabam/glib,bluez-android/glib,justinkb/aosp-bluez.glib,tchakabam/glib,darren-clark/android_platform_external_bluetooth_glib,MathieuDuponchelle/glib,djdeath/glib,krichter722/glib,mzabaluev/glib,lukasz-skalski/glib,endlessm/glib,Distrotech/glib,MathieuDuponchelle/glib,MathieuDuponchelle/glib,cosimoc/glib,ieei/glib,tamaskenez/glib,djdeath/glib,cosimoc/glib,tchakabam/glib,johne53/MB3Glib,pstglia/external-bluetooth-glib,cention-sany/glib,pstglia/external-bluetooth-glib,lukasz-skalski/glib,bluez-android/glib,gale320/glib,pstglia/external-bluetooth-glib,johne53/MB3Glib,lukasz-skalski/glib,01org/android-bluez-glib,01org/android-bluez-glib,iConsole/Console-OS_external_bluetooth_glib,krichter722/glib,darren-clark/android_platform_external_bluetooth_glib,gale320/glib,ieei/glib,pstglia/platform-external-bluetooth-glib,01org/android-bluez-glib,ieei/glib,justinkb/aosp-bluez.glib,darren-clark/android_platform_external_bluetooth_glib,Distrotech/glib,tamaskenez/glib,pstglia/external-bluetooth-glib,ieei/glib,tamaskenez/glib,01org/android-bluez-glib,djdeath/glib,mzabaluev/glib,endlessm/glib,endlessm/glib,pstglia/platform-external-bluetooth-glib,darren-clark/android_platform_external_bluetooth_glib,johne53/MB3Glib,cosimoc/glib,iConsole/Console-OS_external_bluetooth_glib,cention-sany/glib,lukasz-skalski/glib,bluez-android/glib,bluez-android/glib,krichter722/glib,01org/android-bluez-glib,MathieuDuponchelle/glib,pstglia/platform-external-bluetooth-glib,johne53/MB3Glib,djdeath/glib,justinkb/aosp-bluez.glib,gale320/glib,gale320/glib,iConsole/Console-OS_external_bluetooth_glib,pstglia/platform-external-bluetooth-glib,pstglia/external-bluetooth-glib