meson: fix building screen-share module
When building screen-share module with meson loading the module fails with: [00:01:28.604] Failed to load module: /usr/local/lib/weston/screen-share.so: undefined symbol: os_create_anonymous_file Failed to process Wayland connection: Broken pipe failed to create display: Broken pipe
The function os_create_anonymous_file is defined in libshared, adding libshared to the dependency makes sure the function gets compiled into screen-share.so.
Fixes: #208 (closed)
Signed-off-by: Stefan Agner stefan@agner.ch