Oops.  As Pavel Roskin notes, I forgot to conditionally include the __fsetlocking call in libc/unistd/usershell.c.  It should be wrapped and only included if __UCLIBC_HAS_THREADS__ is defined.
Oops.  As Pavel Roskin notes, I forgot to conditionally include
the __fsetlocking call in libc/unistd/usershell.c.  It should
be wrapped and only included if __UCLIBC_HAS_THREADS__ is defined.

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