`_PC_NAME_MAX` is necessary to use `libc::pathconf`. Its value is fixed
to 3 currently, but actually it varies with the platform.
* _PC_NAME_MAX == 3
Linux (glibc): https://sourceware.org/git/?p=glibc.git;a=blob;f=bits/confname.h;h=1c714dfbf9398b8a600f9b69426a7ad8c7e89ab4;hb=HEAD#l32
NaCl (newlib): https://chromium.googlesource.com/native_client/nacl-newlib/+/373135ec5241d09138aa56603742b94b3b64ea1d/newlib/libc/include/sys/unistd.h#430
* _PC_NAME_MAX == 4
Android (Bionic):
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| .. | ||
| lib.rs | ||