testsuite] clean up convoluted dg-final directive in vect-multitypes-12.c

[Janis Johnson <janis_johnson at mentor dot com>]

Test gcc.dg/vect/vect-multitypes uses Tcl conditions within a dg-final
directive, which is something that DejaGnu handles but we strive not to
do.  It's now possible to use supported constructs to get the same
result, so I've cleaned up the test and checked it in as obvious.  I'm
fixing this particular test because I want to add an xfail but want to
keep that change separate from the cleanup.

Janis

Attachment: gcc-20130118-1
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