[new uImage] Add libfdt support to mkimage

Signed-off-by: Bartlomiej Sieka <tur@semihalf.com>
diff --git a/include/libfdt_env.h b/include/libfdt_env.h
index 78f7258..98c522a 100644
--- a/include/libfdt_env.h
+++ b/include/libfdt_env.h
@@ -24,7 +24,11 @@
 #include <stddef.h>
 #include <linux/types.h>
 #include <asm/byteorder.h>
+#ifdef USE_HOSTCC
+#include <string.h>
+#else
 #include <linux/string.h>
+#endif /* USE_HOSTCC */
 
 extern struct fdt_header *fdt;  /* Pointer to the working fdt */