Declare wpa_debug_* variables in src/utils/wpa_debug.h

These were somewhat more hidden to avoid direct use, but there are now
numerous places where these are needed and more justification to make
the extern int declarations available from wpa_debug.h. In addition,
this avoids some warnings from sparse.

Signed-hostap: Jouni Malinen <j@w1.fi>

src/crypto/tls_openssl.c

@@ -2901,7 +2901,6 @@ int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
 static void ocsp_debug_print_resp(OCSP_RESPONSE *rsp)
 {
 #ifndef CONFIG_NO_STDOUT_DEBUG
-	extern int wpa_debug_level;
 	BIO *out;
 	size_t rlen;
 	char *txt;