Log Message:
gssdp: update to 1.0.3.

1.0.3
=====
 - meson build fixes
 - Fix running sniffer from meson build
 - Fix issue on OS X when socket is destroyed after suspend
 - Fix a memory leak in the device sniffer
 - Fix a crash when sending a SSDP message after clearing the custom headers
 - Use utsname.release for Server: header

Bugs fixed in this release:
 - https://gitlab.gnome.org/GNOME/gssdp/issues/1
 - https://bugzilla.gnome.org/show_bug.cgi?id=794340