OPNSense/core 12fac8b. Makefile

make: only let clean clear the src/ directory

Many hours have likely been wasted because it would reset global changes.  ;)

(cherry picked from commit a2fde613b184a07adfd0e9cf40c1de156242c927)
(cherry picked from commit 6566213c42c521fc4a244ad3a06762703f1f4863)
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+3-1Makefile
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