gsettingsbackend.h: pretend to be gio.h
gsettingsbackend.h: pretend to be gio.h

Since #include <gsettingsbackend.h> is a perfectly valid thing for
applications to do, and since we want to include gio headers from
gsettingsbackend.h, we need to effectively disable the #error we would
get from those headers (because we're not coming via gio.h).

We don't want to #include <gio/gio.h> here because this would cause
needless rebuilding of GSettingsBackend, GSettings,
GDelayedSettingsBackend, etc... every time someone changed anything in
any public header.

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