MINOR: proxy/checks: Move parsing of httpchk option in checks.c

Parsing of the proxy directive "option httpchk" have been moved in checks.c.
diff --git a/include/common/defaults.h b/include/common/defaults.h
index 0653a53..3350825 100644
--- a/include/common/defaults.h
+++ b/include/common/defaults.h
@@ -175,7 +175,6 @@
 #define DEF_RISETIME    2
 #define DEF_AGENT_FALLTIME    1
 #define DEF_AGENT_RISETIME    1
-#define DEF_CHECK_REQ   "OPTIONS / HTTP/1.0\r\n"
 #define DEF_CHECK_PATH  ""
 
 
diff --git a/include/proto/checks.h b/include/proto/checks.h
index 4dba34a..cc0ab0b 100644
--- a/include/proto/checks.h
+++ b/include/proto/checks.h
@@ -83,6 +83,8 @@
 			       const char *file, int line);
 int proxy_parse_spop_check_opt(char **args, int cur_arg, struct proxy *curpx, struct proxy *defpx,
 			       const char *file, int line);
+int proxy_parse_httpchk_opt(char **args, int cur_arg, struct proxy *curpx, struct proxy *defpx,
+			    const char *file, int line);
 
 int set_srv_agent_send(struct server *srv, const char *send);