More module fixes (#15)

* Fix framework structure

* more fixes

* imports

Author: kabiroberai

Package.swift

@@ -30,7 +30,8 @@ let package = Package(
         .package(url: "https://github.com/apple/swift-syntax.git", from: "509.0.0"),
     ],
     targets: [
-        .target(name: "CNodeAPI"),
+        .systemLibrary(name: "CNodeAPI"),
+        .target(name: "CNodeAPISupport"),
         .macro(
             name: "NodeAPIMacros",
             dependencies: [
@@ -41,7 +42,7 @@ let package = Package(
         ),
         .target(
             name: "NodeAPI",
-            dependencies: ["CNodeAPI", "NodeAPIMacros"],
+            dependencies: ["CNodeAPI", "CNodeAPISupport", "NodeAPIMacros"],
             swiftSettings: baseSwiftSettings
         ),
         .target(

Sources/CNodeAPI/module.modulemap

@@ -0,0 +1,4 @@
+module CNodeAPI {
+    export Darwin.POSIX
+    header "vendored/node_api.h"
+}