Try to fix Android build by defining DMA_BUF_IOCTL_EXPORT_SYNC_FILE

Author: rocallahan

src/kernel_supplement.h

@@ -8,6 +8,7 @@
 #endif
 
 #include <linux/capability.h>
+#include <linux/dma-buf.h>
 #include <linux/if_tun.h>
 #include <linux/mman.h>
 #include <linux/seccomp.h>
@@ -562,6 +563,10 @@ enum {
 #define ARCH_REQ_XCOMP_PERM 0x1023
 #endif
 
+#ifndef DMA_BUF_IOCTL_EXPORT_SYNC_FILE
+#define DMA_BUF_IOCTL_EXPORT_SYNC_FILE _IOWR(DMA_BUF_BASE, 2, struct dma_buf_export_sync_file)
+#endif
+
 } // namespace rr
 
 // We can't include libc's ptrace.h, so declare this here.

src/test/v4l_dmabuf.c

@@ -4,6 +4,10 @@
 
 #include <linux/dma-buf.h>
 
+#ifndef DMA_BUF_IOCTL_EXPORT_SYNC_FILE
+#define DMA_BUF_IOCTL_EXPORT_SYNC_FILE _IOWR(DMA_BUF_BASE, 2, struct dma_buf_export_sync_file)
+#endif
+
 static const char device_name[] = "/dev/video0";
 
 static void no_v4l2(void) {