runtime: fix goc2c for rename to goc2c and *.goc

Release 2010-04-27. runtime: rename cgo2c, *.cgo to goc2c, *.goc
to avoid confusion with real cgo.

R=rsc
CC=golang-dev
https://golang.org/cl/1868047

src/pkg/runtime/goc2c.c

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-/* Translate a .cgo file into a .c file.  A .cgo file is a combination
+/* Translate a .goc file into a .c file.  A .goc file is a combination
    of a limited form of Go with C.  */
 
 /*
@@ -669,7 +669,7 @@ process_file(void)
 static void
 usage(void)
 {
-	fprintf(stderr, "Usage: cgo2c [--6g | --gc] [file]\n");
+	fprintf(stderr, "Usage: goc2c [--6g | --gc] [file]\n");
 	exit(1);
 }