Extend "make shellcheck" onto autogen.sh

Same as in tcpslice and libpcap.

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 .ci-coverity-scan-build.sh
+	shellcheck -f gcc -e SC2006 autogen.sh build.sh build_matrix.sh build_common.sh .ci-coverity-scan-build.sh

autogen.sh

@@ -8,7 +8,7 @@ maj=`echo "$AUTORECONFVERSION" | cut -d. -f1`
 min=`echo "$AUTORECONFVERSION" | cut -d. -f2`
 # The minimum required version of autoconf is currently 2.69.
 if [ "$maj" = "" ] || [ "$min" = "" ] || \
-   [ "$maj" -lt 2 ] || [ "$maj" -eq 2 -a "$min" -lt 69 ]; then
+   [ "$maj" -lt 2 ] || { [ "$maj" -eq 2 ] && [ "$min" -lt 69 ]; }; then
 	cat >&2 <<-EOF
 	Please install the 'autoconf' package version 2.69 or later.
 	If version 2.69 or later is already installed and there is no