join: remove unused #include "argmatch.h"

Prompted by the syntax-check failure:
  maint.mk: the above files include argmatch.h but don't use it
  make: *** [maint.mk:741: sc_prohibit_argmatch_without_use] Error 1

* src/join.c: Remove include, as the previous commit changed from using
ARRAY_CARDINALITY to countof - for which system.h includes the header.

diff --git a/src/join.c b/src/join.c
index 5cf87d1e8e5e9d03ba1128abf34fc3be9dc69adf..e1899a93a24d52e420d21b12f8f560ed85b2a13d 100644 (file)
--- a/src/join.c
+++ b/src/join.c
@@ -33,7 +33,6 @@
 #include "stdio--.h"
 #include "xmemcoll.h"
 #include "xstrtol.h"
-#include "argmatch.h"
 
 /* The official name of this program (e.g., no 'g' prefix).  */
 #define PROGRAM_NAME "join"