samsung: Compilation fixes

* Add missing headers
* Cast values to correct types

Change-Id: Iaf621c562e884daeb22f6ec700d6989ba6ba1aef
diff --git a/exynos3/s5pc110/libs3cjpeg/JpegEncoder.cpp b/exynos3/s5pc110/libs3cjpeg/JpegEncoder.cpp
index 96cee3d..d6d779a 100644
--- a/exynos3/s5pc110/libs3cjpeg/JpegEncoder.cpp
+++ b/exynos3/s5pc110/libs3cjpeg/JpegEncoder.cpp
@@ -26,6 +26,7 @@
 #include <utils/Log.h>
 #include <sys/mman.h>
 #include <fcntl.h>
+#include <string.h>
 
 #include "JpegEncoder.h"