8c, 8l dynamic loading support.
better mach binaries.
cgo working on darwin+linux amd64+386.
eliminated context switches - pi is 30x faster.
add libcgo to build.

on snow leopard:
  - non-cgo binaries work; all tests pass.
  - cgo binaries work on amd64 but not 386.

R=r
DELTA=2031  (1316 added, 626 deleted, 89 changed)
OCL=35264
CL=35304
diff --git a/misc/cgo/stdio/hello.go b/misc/cgo/stdio/hello.go
new file mode 100644
index 0000000..8809c9a
--- /dev/null
+++ b/misc/cgo/stdio/hello.go
@@ -0,0 +1,12 @@
+// Copyright 2009 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import "stdio"
+
+func main() {
+//	stdio.Stdout.WriteString("hello, world\n");
+	stdio.Puts("hello, world");
+}