curl-config: revert to backticks to support old target envs #13871
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Make an exception for
curl-config
because this script that may berunning on any target system, including old ones, e.g. SunOS 5.10.
Reported-by: Alejandro R. Sedeño
Ref: #13307 (comment)
Follow-up to fa69b41 #13307
Closes #13871