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Fix test suite compilation and sandbox compatibility - #1485
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- Explicitly include <stdlib.h> in test/PortableUtil.hpp. The POSIX functions `setenv` and `unsetenv` are declared in <stdlib.h>. Relying on <unistd.h> to transitively include it fails in environments with stricter C++ standards or different libc implementations. - Replace hardcoded relative/tmp test output paths with `::testing::TempDir()`. This ensures tests do not fail when run concurrently, on read-only filesystems, or within strict build sandboxes (like Bazel test environments).
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setenvandunsetenvare declared in <stdlib.h>. Relying on <unistd.h> to transitively include it fails in environments with stricter C++ standards or different libc implementations.::testing::TempDir(). This ensures tests do not fail when run concurrently, on read-only filesystems, or within strict build sandboxes (like Bazel test environments).