Defeat compiler optimization which assumes function addresses are never NULL

From email:
A warning for people who can be hit by the same or similar issue:
gcc 4.1.2 with -march=i486 here with -Os and even with -O2 or -O
is "optimizing away" the check
       if (_stdio_term)
in libc/stdlib/_atexit.c
which results in a "call 0" and a segfault at exit
if you do not happen to link in stdio.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>

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