Add our first darwin path prebuilt: awk

Test: build on mac
Change-Id: I661616c24d611f774c2de5b10995e4f9cdcf7f94
diff --git a/path/darwin-x86/awk b/path/darwin-x86/awk
new file mode 120000
index 0000000..ced0fa9
--- /dev/null
+++ b/path/darwin-x86/awk
@@ -0,0 +1 @@
+../../darwin-x86/bin/one-true-awk
\ No newline at end of file