configure.ac: robustify netlink.h check
configure.ac: robustify netlink.h check

https://bugzilla.gnome.org/show_bug.cgi?id=666173

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