Linux GUI support 1.0.71

• weston : 2318feca
• FreeRDP : c4030980
• pulseaudio: 6f045ff0

Changes:

WSLg:

• WSLGd: don't allow arbitrary settings for shell

WSLDVCPlugin:

• WSLDVCPlugin: fix ReadSTRING null termination
• WSLDVCPlugin: update toolset to v143 and enable SpectreMitigation
• WSLDVCPlugin: enable code flow guard on RDP Plugin

Weston:

• rdp-backend: maintain wl-seat even RDP is disconnected