Fix build on old kernels
Fix build on old kernels

Cope with BTRFS_SUPER_MAGIC not being defined.

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