Make AC_INCLUDES_DEFAULT expand its argument (shell functions 5/n)

[Paolo Bonzini]

This is quite controversial.  I need to have AC_INCLUDES_DEFAULT expand its
argument to determine whether it is empty or not, but m4_quote is not
sufficient because it would have to add a new-line just like the
IF-NOT-EMPTY part of the m4_ifval invocation.

I am relying on m4_changecom, but I am not sure of its effects and would
rather have someone more expert think of a better way.

The need for this arises from this idiom in the shell functions patch,
needed to pass to the shell function the INCLUDES argument:
"AC_INCLUDES_DEFAULT([AS_ESCAPE([$4], ["])])"

Paolo

2003-05-05  Paolo Bonzini  <address@hidden>

        * lib/autoconf/headers.m4 (AC_HEADERS_DEFAULT):
        Expand $1 before judging if it is empty or not.

ac-includes-default.patch
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