oeqa/selftest/gotoolchain: Fix temp file cleanup
The go tests leave readonly files and directories behind.
Fix this to allow cleanup.
[YOCTO #14575]
Signed-off-by: 
Richard Purdie <richard.purdie@linuxfoundation.org>
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The go tests leave readonly files and directories behind.
Fix this to allow cleanup.
[YOCTO #14575]
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>