umoci: buildFlagsArray -> ldflags

pkgs/applications/virtualization/umoci/default.nix

···
 
   doCheck = false;
 
-  buildFlagsArray = [ "-ldflags=-s -w -X main.version=${version}" ];
+  ldflags = [ "-s" "-w" "-X main.version=${version}" ];
 
   nativeBuildInputs = [ go-md2man installShellFiles ];