windows: hatred rising

The lib files are of course stubs and not actually static libraries,
which means we have to distribute the DLL as well. Unfortunately.
Incredibly bad operating system. If this doesn't work, I quit.

build.zig

@@ -18,12 +18,23 @@ pub fn build(b: *std.Build) void {
     });
 
     if (target.result.os.tag == .windows) {
-        if (target.result.cpu.arch == .x86)
-            exe.addObjectFile(b.path("deps/labjack/windows/ljackuw32.lib"))
-        else if (target.result.cpu.arch == .x86_64)
-            exe.addObjectFile(b.path("deps/labjack/windows/ljackuw64.lib"))
-        else
-            @panic("Unsupported CPU arch for Windows build (must be x86 or x86_64).");
+        if (target.result.cpu.arch == .x86) {
+            exe.addObjectFile(b.path("deps/labjack/windows/ljackuw32.lib"));
+            b.getInstallStep().dependOn(
+                &b.addInstallBinFile(
+                    b.path("deps/labjack/windows/ljackuw32.dll"),
+                    "ljackuw.dll",
+                ).step,
+            );
+        } else if (target.result.cpu.arch == .x86_64) {
+            exe.addObjectFile(b.path("deps/labjack/windows/ljackuw64.lib"));
+            b.getInstallStep().dependOn(
+                &b.addInstallBinFile(
+                    b.path("deps/labjack/windows/ljackuw64.dll"),
+                    "ljackuw.dll",
+                ).step,
+            );
+        } else @panic("Unsupported CPU arch for Windows build (must be x86 or x86_64).");
     } else {
         const ljacklm_dep = b.dependency(
             "ljacklm",