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Wordexp() should be thread safe.

Hi,

I do not think that wordexp() is described clearly as 
MT-unsafe on the specification. 

Wordexp() is not thread safe. Because, wordexp() uses 
__setenv() and __unsetenv() internally.

# grep -n setenv ./posix/wordexp.c
857:  __unsetenv ("IFS");
1869:   __setenv (env, value, 1);

Therefore, if a lot of wordexp() is executed at the same
 time, SIGSEGV can be generated. 

Example:tst-worexp2.tar.gz

Reference:
http://sourceware.org/bugzilla/show_bug.cgi?id=4887

Attachment: tst-wordexp2.tar.gz
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