Update JavaScriptKit

Author: kateinoigakukun

Diff for: .github/workflows/test.yml

@@ -8,7 +8,7 @@ jobs:
         os: [macOS-10.15]
         include:
           - os: macOS-10.15
-            toolchain: https://github.com/swiftwasm/swift/releases/download/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-03-08-a/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-03-08-a-osx.tar.gz
+            toolchain: https://github.com/swiftwasm/swift/releases/download/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-04-27-a/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-04-27-a-osx.tar.gz
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout

Diff for: .swift-version

@@ -1 +1 @@
-wasm-DEVELOPMENT-SNAPSHOT-2020-03-08-a
+wasm-DEVELOPMENT-SNAPSHOT-2020-04-27-a

Diff for: Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.2
+// swift-tools-version:5.3
 
 import PackageDescription
 
@@ -12,22 +12,28 @@ let package = Package(
             name: "JavaScriptKit",
             dependencies: ["_CJavaScriptKit"],
             linkerSettings: [
-              .unsafeFlags([
-                "-Xlinker",
-                "--export=swjs_call_host_function",
-                "-Xlinker",
-                "--export=swjs_prepare_host_function_call",
-                "-Xlinker",
-                "--export=swjs_cleanup_host_function_call"
-              ])
+                .unsafeFlags(
+                    [
+                        "-Xlinker",
+                        "--export=swjs_call_host_function",
+                        "-Xlinker",
+                        "--export=swjs_prepare_host_function_call",
+                        "-Xlinker",
+                        "--export=swjs_cleanup_host_function_call"
+                    ],
+                    .when(platforms: [.wasi])
+                )
             ]),
         .target(
             name: "_CJavaScriptKit",
             linkerSettings: [
-              .unsafeFlags([
-                "-Xlinker",
-                "--allow-undefined",
-              ])
+                .unsafeFlags(
+                    [
+                        "-Xlinker",
+                        "--allow-undefined",
+                    ],
+                    .when(platforms: [.wasi])
+                )
             ]),
         .testTarget(
             name: "JavaScriptKitTests",