[sr #110660] AC_LANG_INT_SAVE (used by AC_CHECK_SIZEOF) includes stdlib.h without checking whether it actually exists

Update of sr #110660 (project autoconf):

                Priority:              5 - Normal => 3 - Low                
                Severity:              3 - Normal => 1 - Wish               

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Follow-up Comment #3:

> This fails if stdlib.h doesn't actually exist.
Yes, and that's documented behavior. The Autoconf manual says:

> If your program needs to be portable to a _freestanding_
> environment, such as an embedded OS that doesn't provide all of the
> facilities of the C90 standard library, you may need to test for some of
> the above headers as well.  Note that many Autoconf macros internally
> assume that the complete set of C90 headers are available.
It'd be nice if Autoconf also worked for freestanding programs too. That'd
require a bit of work though. In the meantime I'll mark this as a wishlist
item.


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