C++ PATCH for c++/43036 (infinite loop on circular array variant list)

[Jason Merrill]

The C++ front end wants to retain the property that TYPE_MAIN_VARIANT of 
an ARRAY_TYPE gives you the main variant all the way down to the first 
non-array type, in the same way that applying cv-quals to an array type 
applies them to the element type.  Previously this was done in 
cp_build_qualified_type_real in a strange way that goes back and messes 
with the TYPE_MAIN_VARIANT of other types as well, which resulted in 
this bug.

This patch sets TYPE_MAIN_VARIANT appropriately in 
build_cplus_array_type instead, much more simply.

Tested x86_64-pc-linux-gnu, applied to trunk.
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