librtlsdr: add .hash file

Fixes:
http://autobuild.buildroot.org/results/2a0/2a0e3d64aa1a9a8aaf019c411377b2f4e3c51aae/
http://autobuild.buildroot.org/results/c81/c814311099ff930c961e637b843a8591e8826b75/

Similar to jquery-keyboard, it seems the librtlsdr 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/librtlsdr/librtlsdr.hash b/package/librtlsdr/librtlsdr.hash
new file mode 100644 (file)
index 0000000..24bca46
--- /dev/null
+++ b/package/librtlsdr/librtlsdr.hash
@@ -0,0 +1,2 @@
+# Locally calculated
+sha256 98fb5c34ac94d6f2235a0bb41a08f8bed7949e1d1b91ea57a7c1110191ea58de  librtlsdr-v0.5.3.tar.gz