GCancellable: Fix build on Win32
GCancellable: Fix build on Win32

https://bugzilla.gnome.org/show_bug.cgi?id=653522

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