Avoid tests failures in C++98

[François Dumont]

Running some tests in C++98 show that the error checked by following 
tests are those of the C++11 mode.

This patch add target c++11 so that those tests are ignored in previous 
mode.

 Â Â Â  * testsuite/23_containers/deque/requirements/dr438/assign_neg.cc:
 Â Â Â  Add target c++11.
 Â Â Â  * 
testsuite/23_containers/deque/requirements/dr438/constructor_1_neg.cc:
 Â Â Â  Likewise.
 Â Â Â  * 
testsuite/23_containers/deque/requirements/dr438/constructor_2_neg.cc:
 Â Â Â  Likewise.
 Â Â Â  * testsuite/23_containers/deque/requirements/dr438/insert_neg.cc:
 Â Â Â  Likewise.

Ok to commit ?

François

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