configure: Split valgrind test into pragma test and valgrind.h test
Split the configure test that checks for valgrind into two, one part checking whether we have the gcc pragma to disable unused-but-set variables, and the other part checking for the existence of valgrind.h. The first of these has to be compiled with -Werror and the second does not and shouldn't generate any warnings. This (a) allows us to enable "make errors in configure tests be build failures" and (b) enables use of valgrind on systems with a gcc which doesn't know about -Wunused-but-set-varibale, like Debian squeeze. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
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