win32: Implement _g_dbus_get_machine_id using machine guid
win32: Implement _g_dbus_get_machine_id using machine guid

This is what libdbus uses, so we're compatible.
(cherry picked from commit 5fb44f70dcac16ff6f13d3d36c330ddd617a5d97)

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