GCancellable: Use g_unix_pipe_flags with FD_CLOEXEC
GCancellable: Use g_unix_pipe_flags with FD_CLOEXEC

The old code was creating a pipe and setting FD_CLOEXEC
non-atomically.

https://bugzilla.gnome.org/show_bug.cgi?id=649225

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