Only symlink posix prefixes

Fixes #13

Author: mxcl

pkgm.ts

@@ -212,7 +212,12 @@ async function mirror_directory(dst: string, src: string, prefix: string) {
 }
 
 async function symlink(src: string, dst: string) {
-  await processEntry(src, dst);
+  for (const base of ["bin", "sbin", "share", "lib", "libexec", "var", "etc"]) {
+    const foo = join(src, base);
+    if (existsSync(foo)) {
+      await processEntry(foo, join(dst, base));
+    }
+  }
 
   async function processEntry(sourcePath: string, targetPath: string) {
     const fileInfo = await Deno.lstat(sourcePath);