egl/android: replace call to dup(2) with fcntl(F_DUPFD_CLOEXEC)

Without this fix, duplicated file descriptors leak into child processes.
See commit aaac913e90 for one instance
where the same fix was employed.

Cc: <mesa-stable@lists.freedesktop.org>
Signed-off-by: Matt Whitlock <freedesktop@mattwhitlock.name>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/egl/drivers/dri2/platform_android.c

@@ -29,6 +29,7 @@
 
 #include <errno.h>
 #include <dlfcn.h>
+#include <fcntl.h>
 #include <xf86drm.h>
 
 #if ANDROID_VERSION >= 0x402
@@ -830,7 +831,7 @@ droid_open_device(void)
       fd = -1;
    }
 
-   return (fd >= 0) ? dup(fd) : -1;
+   return (fd >= 0) ? fcntl(fd, F_DUPFD_CLOEXEC, 3) : -1;
 }
 
 /* support versions < JellyBean */