gmain: Use sigset_t for keeping track of installed signals
gmain: Use sigset_t for keeping track of installed signals

Minor code cleanup.

https://bugzilla.gnome.org/show_bug.cgi?id=652072

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