Makefile.in: Add the shellcheck target

Run shellcheck on the build.sh and the build_matrix.sh scripts.
(using 'gcc' format: GCC compatible output. See the shellcheck man page)

[skip ci]

diff --git a/Makefile.in b/Makefile.in
index 8e970553ede77334ee270a4543fd3f9ad7d1dbb2..4ffca817b328357d79d1f992dca700f14c7505a2 100644 (file)
--- a/Makefile.in
+++ b/Makefile.in
@@ -474,3 +474,6 @@ testlist:
 
 depend:
        $(MKDEP) -c "$(CC)" -m "$(DEPENDENCY_CFLAG)" -s "$(srcdir)" $(DEFS) $(INCLS) $(SRC) $(LIBNETDISSECT_SRC)
+
+shellcheck:
+       shellcheck -f gcc build.sh build_matrix.sh