Basic test for some static return functions #157
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In contribution to the current discussion about functions that always return the same function, I added two tests to check whether getenv, errno_location, gmtime and localtime return pointers that alias according to SVF. According to the documentation, gmtime and localtime may share the same return object. This is the case in glibc, so i added a test for that too. Although my interpretation of may alias might be off.
I do expect these to fail with the latest version.
Please let me know if there are any issues.