libbsd: 0.8.7 -> 0.9.1

Semi-automatic update generated by
https://github.com/ryantm/nixpkgs-update tools. This update was made
based on information from
libbsd

pkgs/development/libraries/libbsd/default.nix

@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   name = "libbsd-${version}";
-  version = "0.8.7";
+  version = "0.9.1";
 
   src = fetchurl {
     url = "https://libbsd.freedesktop.org/releases/${name}.tar.xz";
-    sha256 = "0c9bl49zs0xdddcwj5dh0lay9sxi2m1yi74848g8p87mb87g2j7m";
+    sha256 = "1957w2wi7iqar978qlfsm220dwywnrh5m58nrnn9zmi74ds3bn2n";
   };
 
   # darwin changes configure.ac which means we need to regenerate