exynos4: hwc: GLES/gl.h is needed regardless of HWC_HWOVERLAY

Change-Id: I83108ba3d2442fbc0a252bd98c988235bafe7dc8
diff --git a/exynos4/hal/libhwcomposer/SecHWC.cpp b/exynos4/hal/libhwcomposer/SecHWC.cpp
index b652837..9aac891 100644
--- a/exynos4/hal/libhwcomposer/SecHWC.cpp
+++ b/exynos4/hal/libhwcomposer/SecHWC.cpp
@@ -36,9 +36,9 @@
 #include "SecHWCUtils.h"
 
 #include "gralloc_priv.h"
-#ifdef HWC_HWOVERLAY
+
 #include <GLES/gl.h>
-#endif
+
 #if defined(BOARD_USES_HDMI)
 #include "SecHdmiClient.h"
 #include "SecTVOutService.h"