gspawn: Fix annotations
gspawn: Fix annotations

g-ir-scanner wants guint8.

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