Always #include <sys/...>, not <linux/...>.

Change-Id: I31b9a9a8202cf60380380499702517e47762366a
diff --git a/src/utils/os_unix.c b/src/utils/os_unix.c
index 10b9e0d..b0c3360 100644
--- a/src/utils/os_unix.c
+++ b/src/utils/os_unix.c
@@ -12,7 +12,7 @@
 
 #ifdef ANDROID
 #include <sys/capability.h>
-#include <linux/prctl.h>
+#include <sys/prctl.h>
 #include <private/android_filesystem_config.h>
 #endif /* ANDROID */