Build dynamic framework on Linux

Author: colemancda

Package.swift

@@ -1,12 +1,18 @@
 // swift-tools-version:5.0
 import PackageDescription
 
+#if os(Linux)
+let libraryType: PackageDescription.Product.Library.LibraryType = .dynamic
+#else
+let libraryType: PackageDescription.Product.Library.LibraryType = .static
+#endif
+
 let package = Package(
     name: "TLVCoding",
     products: [
         .library(
             name: "TLVCoding",
-            type: .dynamic,
+            type: libraryType,
             targets: ["TLVCoding"]
         )
     ],