[Chapel Merge] fix quickstart builds

Branch: refs/heads/main
Revision: fdd74dd
Author: mppf
Log Message:

Merge pull request #17982 from mppf/follow-17979

fix quickstart builds

Following #17979 which added too much checking since
CHPL_MAKE_THIRD_PARTY_LINK_ARGS isn't always defined
to be something other than the empty string
(e.g. it was failing for quickstart config)

Reviewed by @ronawho - thanks!