[C++ PATCH] Fix a regression from build_cplus_array_type recent change (PR c++/54038)

[Jason Merrill]

On 07/20/2012 09:26 AM, Jakub Jelinek wrote:
> As detailed in the PR, I believe we should only add c into m's variant chain
> if m's element type is the main variant of c's element type.

We want c to get onto the appropriate variant chain even if it isn't 
m's, so I'm applying this patch instead.

Tested x86_64-pc-linux-gnu, applying to trunk and 4.7.
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