Fix broken build with -Wundefined
Fix broken build with -Wundefined

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