uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/servers/monitoring/prometheus/mysqld-exporter.nix

@@ -0,0 +1,38 @@
+{ lib, buildGoModule, fetchFromGitHub }:
+
+buildGoModule rec {
+  pname = "mysqld_exporter";
+  version = "0.14.0";
+  rev = "v${version}";
+
+  src = fetchFromGitHub {
+    inherit rev;
+    owner = "prometheus";
+    repo = "mysqld_exporter";
+    sha256 = "sha256-SMcpQNygv/jVLNuQP8V6BH/CmSt5Y4dzYPsboTH2dos=";
+  };
+
+  vendorSha256 = "sha256-M6u+ZBEUqCd6cKVHPvHqRiXLbuWz66GK+ybIQm+5tQE=";
+
+  ldflags = let t = "github.com/prometheus/common/version"; in [
+    "-s" "-w"
+    "-X ${t}.Version=${version}"
+    "-X ${t}.Revision=${rev}"
+    "-X ${t}.Branch=unknown"
+    "-X ${t}.BuildUser=nix@nixpkgs"
+    "-X ${t}.BuildDate=unknown"
+  ];
+
+  # skips tests with external dependencies, e.g. on mysqld
+  preCheck = ''
+    buildFlagsArray+="-short"
+  '';
+
+  meta = with lib; {
+    description = "Prometheus exporter for MySQL server metrics";
+    homepage = "https://github.com/prometheus/mysqld_exporter";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ benley globin ];
+    platforms = platforms.unix;
+  };
+}