[Bug libc/21605] declare strtol pure

[msebor at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21605

--- Comment #2 from Martin Sebor <msebor at gmail dot com> ---
Since/when errno is a function, testing it between the successive calls would
disable the optimization.  What would a test case that would expose this as a
problem?

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