glib-compile-resources: Forward errors from spawned processes
glib-compile-resources: Forward errors from spawned processes

We just grab stderr from gdk-pixbuf-to-csource and xmllint and include
it in the error message. It's the best we can do.

bluez-android/glib,justinkb/aosp-bluez.glib,iConsole/Console-OS_external_bluetooth_glib,justinkb/aosp-bluez.glib,darren-clark/android_platform_external_bluetooth_glib,iConsole/Console-OS_external_bluetooth_glib,01org/android-bluez-glib,pstglia/platform-external-bluetooth-glib,bluez-android/glib,pstglia/platform-external-bluetooth-glib,pstglia/external-bluetooth-glib,justinkb/aosp-bluez.glib,justinkb/aosp-bluez.glib,pstglia/external-bluetooth-glib,01org/android-bluez-glib,01org/android-bluez-glib,darren-clark/android_platform_external_bluetooth_glib,justinkb/aosp-bluez.glib,pstglia/external-bluetooth-glib,pstglia/platform-external-bluetooth-glib,bluez-android/glib,darren-clark/android_platform_external_bluetooth_glib,iConsole/Console-OS_external_bluetooth_glib,01org/android-bluez-glib,iConsole/Console-OS_external_bluetooth_glib,darren-clark/android_platform_external_bluetooth_glib,01org/android-bluez-glib,bluez-android/glib,bluez-android/glib,pstglia/platform-external-bluetooth-glib,iConsole/Console-OS_external_bluetooth_glib,pstglia/external-bluetooth-glib,pstglia/platform-external-bluetooth-glib,pstglia/external-bluetooth-glib,darren-clark/android_platform_external_bluetooth_glib