link iconv on windows

Author: Techatrix

.github/workflows/ci.yaml

@@ -33,4 +33,9 @@ jobs:
         run: zig fmt --ast-check --check .
 
       - name: Build
+        if: matrix.os != 'windows-latest'
         run: zig build --summary all
+
+      - name: Build (windows)
+        if: matrix.os == 'windows-latest'
+        run: zig build -Diconv=false --summary all

build.zig

@@ -193,7 +193,7 @@ pub fn build(b: *std.Build) void {
     if (history) xml_lib.root_module.linkSystemLibrary("history", .{});
     if (lzma) xml_lib.root_module.linkSystemLibrary("lzma", .{});
     if (icu) xml_lib.root_module.linkSystemLibrary("icu-i18n", .{});
-    // if (iconv) xml_lib.root_module.linkSystemLibrary("iconv", .{});
+    if (iconv and target.result.os.tag == .windows) xml_lib.root_module.linkSystemLibrary("iconv", .{});
     if (target.result.os.tag == .windows) xml_lib.root_module.linkSystemLibrary("bcrypt", .{});
     if (http and target.result.os.tag == .windows) xml_lib.root_module.linkSystemLibrary("ws2_32", .{});