gnulib update breaks clisp: stdlib.h:189:5: error: #if with no expression

[Sam Steingold]

I updated clisp to the latest gnulib (to take advantage of the mktime fix)
and now build fails with this:

./stdlib.h:189:5: error: #if with no expression

this comes from

#if @GNULIB_MKOSTEMP@
# if !...@have_mkostemp@