Fix memoryleak in conftest.c

[Raphael Isemann]

Hi,

The attached patch fixes a memory leak in the conftest.c file. I'm
aware this code is only test compiled and never executed so there is
no actual leak, but the obvious memory leak here is causing problems
with a downstream compiler (the compiler is more strict about memory
leaks and keeps generating warnings when used in autoconf projects
that compile this file during configure).

Thanks,
- Raphael Isemann

autoconf-leak.diff
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