When parse-guessing a package Makefile, lintpkgsrc tries to evaluate
variable expressions such as ${VAR:S,from,to,} by passing them through
Perl's eval function.
In a variable expression of the form ${VAR:S,@exec@,${exec},}, this
produced Perl warnings due to the unescaped '@':
Possible unintended interpolation of @exec in string at
(eval 63841) line 1.
As a quick fix, skip ':S' modifiers that contain the character '@' for
now. A proper fix will follow.
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