[PATCH] configure: add AC_LANG_SOURCE call within AC_COMPILE_IFELSE

[Eric Anholt]

Emil Velikov <emil.l.velikov at gmail.com> writes:

> Documentation states that AC_*_IFELSE has to use AC_LANG_SOURCE or
> friends in order to generate the source code to compile.
> AC_LINK_IFELSE already handles this, thus convert AC_COMPILE_IFELSE
> to silence the final autoconf warnings.
>
> Signed-off-by: Emil Velikov <emil.l.velikov at gmail.com>

Pushed.  Thanks!
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