BUILD: stdbool is not portable

Benjamin Polidore reported a build issue on Solaris with gcc 4.2.4 where
stdbool is not usable without c99. It only appeared at one location in
dumpstats and is totally useless, let's use the more common and portable
int as everywhere else.
diff --git a/src/dumpstats.c b/src/dumpstats.c
index f2849ef..cddadab 100644
--- a/src/dumpstats.c
+++ b/src/dumpstats.c
@@ -14,7 +14,6 @@
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
-#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -66,7 +65,7 @@
 static int stats_dump_full_sess_to_buffer(struct stream_interface *si, struct session *sess);
 static int stats_dump_sess_to_buffer(struct stream_interface *si);
 static int stats_dump_errors_to_buffer(struct stream_interface *si);
-static int stats_table_request(struct stream_interface *si, bool show);
+static int stats_table_request(struct stream_interface *si, int show);
 static int stats_dump_proxy(struct stream_interface *si, struct proxy *px, struct uri_auth *uri);
 static int stats_dump_http(struct stream_interface *si, struct uri_auth *uri);
 
@@ -3957,12 +3956,12 @@
  * properly set. It returns 0 if the output buffer is full and it needs
  * to be called again, otherwise non-zero.
  */
-static int stats_table_request(struct stream_interface *si, bool show)
+static int stats_table_request(struct stream_interface *si, int show)
 {
 	struct session *s = si->conn->xprt_ctx;
 	struct ebmb_node *eb;
 	int dt;
-	bool skip_entry;
+	int skip_entry;
 
 	/*
 	 * We have 3 possible states in si->conn->xprt_st :
@@ -4027,7 +4026,7 @@
 			break;
 
 		case STAT_ST_LIST:
-			skip_entry = false;
+			skip_entry = 0;
 
 			if (si->applet.ctx.table.data_type >= 0) {
 				/* we're filtering on some data contents */
@@ -4069,7 +4068,7 @@
 				     (si->applet.ctx.table.data_op == STD_OP_EQ ||
 				      si->applet.ctx.table.data_op == STD_OP_LT ||
 				      si->applet.ctx.table.data_op == STD_OP_LE)))
-					skip_entry = true;
+					skip_entry = 1;
 			}
 
 			if (show && !skip_entry &&