Minor fixes to ensure tests build properly

Author: danielinux

Makefile

@@ -1,5 +1,5 @@
 CC?=gcc
-CFLAGS:=-Wall -Werror -Wextra -I.
+CFLAGS:=-Wall -Werror -Wextra -I. -D_GNU_SOURCE
 CFLAGS+=-g -ggdb
 LDFLAGS+=-pthread
 

src/test/test_linux_eventloop.c

@@ -30,7 +30,7 @@
 #include "config.h"
 #include "wolfip.h"
 
-#define TEST_SIZE (8 * 1024)
+#define TEST_SIZE (4 * 1024)
 
 #define BUFFER_SIZE TEST_SIZE