gunixcredentialsmessage: fix this on FreeBSD
gunixcredentialsmessage: fix this on FreeBSD

pointed out by Henry Hu
https://bugzilla.gnome.org/show_bug.cgi?id=628904

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