CLEANUP: regex: use the build options list to report the regex type

This removes 3 #ifdef from haproxy.c.
diff --git a/src/haproxy.c b/src/haproxy.c
index bf7dfc1..4de12cd 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -402,29 +402,6 @@
 	printf("Built without OpenSSL support (USE_OPENSSL not set)\n");
 #endif
 
-#ifdef USE_PCRE
-	printf("Built with PCRE version : %s\n", (HAP_XSTRING(Z PCRE_PRERELEASE)[1] == 0)?
-		HAP_XSTRING(PCRE_MAJOR.PCRE_MINOR PCRE_DATE) :
-		HAP_XSTRING(PCRE_MAJOR.PCRE_MINOR) HAP_XSTRING(PCRE_PRERELEASE PCRE_DATE));
-	printf("Running on PCRE version : %s", pcre_version());
-	printf("\nPCRE library supports JIT : ");
-#ifdef USE_PCRE_JIT
-	{
-		int r;
-		pcre_config(PCRE_CONFIG_JIT, &r);
-		if (r)
-			printf("yes");
-		else
-			printf("no (libpcre build without JIT?)");
-	}
-#else
-	printf("no (USE_PCRE_JIT not set)");
-#endif
-	printf("\n");
-#else
-	printf("Built without PCRE support (using libc's regex instead)\n");
-#endif
-
 	list_for_each_entry(item, &build_opts_list, list) {
 		puts(item->str);
 	}
diff --git a/src/regex.c b/src/regex.c
index be4fe5b..dd77194 100644
--- a/src/regex.c
+++ b/src/regex.c
@@ -14,6 +14,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <types/global.h>
 #include <common/config.h>
 #include <common/defaults.h>
 #include <common/regex.h>
@@ -326,6 +327,34 @@
 	return 1;
 }
 
+__attribute__((constructor))
+static void __regex_init(void)
+{
+	char *ptr = NULL;
+
+#ifdef USE_PCRE
+	memprintf(&ptr, "Built with PCRE version : %s", (HAP_XSTRING(Z PCRE_PRERELEASE)[1] == 0)?
+		HAP_XSTRING(PCRE_MAJOR.PCRE_MINOR PCRE_DATE) :
+		HAP_XSTRING(PCRE_MAJOR.PCRE_MINOR) HAP_XSTRING(PCRE_PRERELEASE PCRE_DATE));
+	memprintf(&ptr, "%s\nRunning on PCRE version : %s", ptr, pcre_version());
+
+	memprintf(&ptr, "%s\nPCRE library supports JIT : %s", ptr,
+#ifdef USE_PCRE_JIT
+		  ({
+			  int r;
+			  pcre_config(PCRE_CONFIG_JIT, &r);
+			  r ? "yes" : "no (libpcre build without JIT?)";
+		  })
+#else
+		  "no (USE_PCRE_JIT not set)"
+#endif
+		  );
+#else
+	memprintf(&ptr, "Built without PCRE support (using libc's regex instead)");
+#endif
+	hap_register_build_opts(ptr, 1);
+}
+
 /*
  * Local variables:
  *  c-indent-level: 8