L_tmpnam in stdio_lim.h

[NIIBE Yutaka]

Hi,  

I changed my environment to GNU Libc 2.0.97 from 2.0.94.  I've found
imake core dumps when I set TMPDIR=/var/tmp.

This is because imake calls tmpnam with NULL argument and doesn't
check its return value.

But if it L_tmpnam is more than or equal to 20, imake wouldn't dump
core... (sizeof ("/var/tmp/fileXXXXXX") == 20). 

Is there any reason why L_tmpnam is 19?

Thanks, 
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