libgo patch committed: Pass down newly built gccgo in TestScript

[Ian Lance Taylor <iant at golang dot org>]

This patch changes libgo so that the cmd/go TestScript test passes
down the newly built gccgo in TestScript.  This permits TestScript to
work when gccgo is not installed.  Previous testing was using a
previously installed gccgo, not the newly built one.

This revealed that the testing of whether an internal package is
permitted was incorrect for standard library packages, since the
uninstalled gccgo can see internal packages in the uninstalled libgo.
This patch fixes the internal package tests.

This permitted removing a couple of gccgo-specific changes in the testsuite.

Bootstrapped and ran Go testsuite on x86_64-pc-linux-gnu.  Committed
to mainline.

Ian

Attachment: patch.txt
Description: Text document