Fix an oversight

This oversight is that Gavin did not change `gen/strgen.sh` when he
changed `gen/strgen.c` to remove an unused parameter.

gen/strgen.sh

@@ -32,18 +32,17 @@ export LC_CTYPE=C
 
 progname=${0##*/}
 
-if [ $# -lt 4 ]; then
-	echo "usage: $progname input output name header [label [define [remove_tabs]]]"
+if [ $# -lt 3 ]; then
+	echo "usage: $progname input output name [label [define [remove_tabs]]]"
 	exit 1
 fi
 
 input="$1"
 output="$2"
 name="$3"
-header="$4"
-label="$5"
-define="$6"
-remove_tabs="$7"
+label="$4"
+define="$5"
+remove_tabs="$6"
 
 exec < "$input"
 exec > "$output"