Tools/scripts: limit scope the script searches

The script now searches on limited depth and ignores distfiles folder.

Reported by:	diizzy

Tools/scripts/search_lib_depends_and_bump.sh

@@ -33,7 +33,7 @@ PORT_TO_SEARCH=${1}
 BASEDIR=$(pwd)
 # Get a list of all ports
 echo "Prepare a list of all ports"
-ports=$(find . -name Makefile ! -path "./Tools/* | sort")
+ports=`find . -name Makefile -maxdepth 3 -not \( -path "./distfiles/*" -prune \) -not \( -path "./Tools/*" -prune \) -print | sort`
 echo "done."
 echo