opencv: add .hash file

Fixes:
http://autobuild.buildroot.org/results/e06/e06f0e6edd5d8013ff5e12e2b7253e99a1d1fa2e/

Similar to jquery-keyboard, it seems the opencv tarball on the autobuilder
is corrupt.  Fix it by adding a .hash file so it falls back to our s.b.o
mirror.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

diff --git a/package/opencv/opencv.hash b/package/opencv/opencv.hash
new file mode 100644 (file)
index 0000000..0ebe450
--- /dev/null
+++ b/package/opencv/opencv.hash
@@ -0,0 +1,2 @@
+# Locally calculated
+sha256 a4cbcd2d470860b0cf1f8faf504619c18a8ac38fd414c5a88ed3e94c963aa750  opencv-2.4.12.3.tar.gz