GSettings: no writability->value change assumption
GSettings: no writability->value change assumption

GSettings internally assumed that a change in key writability implied a
change in value.  That may be true for some backends.  Let those
backends deal with the situation for themselves.

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