Only ship scripts to clients that have that plugin's supported OS.
Only ship scripts to clients that have that plugin's supported OS.

This also handles clients which haven't updated the Sal scripts by just
sending all scripts to them.

sheagcraig/sal,sheagcraig/sal,salopensource/sal,sheagcraig/sal,salopensource/sal,salopensource/sal,salopensource/sal,sheagcraig/sal