Update for zig-master

build.zig

@@ -1,25 +1,21 @@
 const std = @import("std");
 const builtin = @import("builtin");
 
-pub fn build(b: *std.build.Builder) !void {
+pub fn build(b: *std.Build) !void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{ .preferred_optimize_mode = .ReleaseSmall });
 
     const dsvpn = b.addExecutable(.{
         .name = "dsvpn",
         .target = target,
         .optimize = optimize,
+        .strip = true,
     });
     dsvpn.linkLibC();
-    dsvpn.strip = true;
     dsvpn.addIncludePath(.{ .path = "include" });
     dsvpn.defineCMacro("_GNU_SOURCE", "1");
     const source_files = &.{ "src/charm.c", "src/os.c", "src/vpn.c" };
-    if (@hasDecl(std.Build.Step.Compile, "AddCSourceFilesOptions")) {
-        dsvpn.addCSourceFiles(.{ .files = source_files });
-    } else {
-        dsvpn.addCSourceFiles(source_files, &.{});
-    }
+    dsvpn.addCSourceFiles(.{ .files = source_files });
     b.installArtifact(dsvpn);
     const run_cmd = b.addRunArtifact(dsvpn);
     run_cmd.step.dependOn(b.getInstallStep());