[vect, mips] run the vect testsuite even no paired single support

[Eric Fisher]

Hi,

This patch change the vect.exp to run the vect testsuite even the
target has no paired single support.

Tested on ia64 machine:

Running /tools/trunk/gcc/testsuite/gcc.dg/vect/vect.exp ...
FAIL: gcc.dg/vect/pr40254.c execution test

		=== gcc Summary ===

# of expected passes		53
# of unexpected failures	1
# of expected failures		6
# of unsupported tests		487
tools/build-trunk/gcc/xgcc  version 4.6.0 20100630 (experimental) (GCC)


Thanks,
Eric
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