Makefile.in: Add the Coverity Scan script to the shellcheck target

[skip ci]

Author: fxlb

Makefile.in

@@ -569,4 +569,4 @@ depend:
 	@$(MKDEP) -c "$(CC)" -m "$(DEPENDENCY_CFLAG)" -s "$(srcdir)" $(DEFS) $(INCLS) $(SRC) $(LIBNETDISSECT_SRC)
 
 shellcheck:
-	shellcheck -f gcc -e SC2006 build.sh build_matrix.sh build_common.sh
+	shellcheck -f gcc -e SC2006 build.sh build_matrix.sh build_common.sh .ci-coverity-scan-build.sh