[xml] configure maintenance

[Stefan Kost <ensonic hora-obscura de>]

Hi,

independent from the other patches I am sending, these are quite
straight forward.

Stefan

Attachment: 0035-configure-support-silent-automake-rules-if-possible.patch
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Attachment: 0037-configure-acconfig.h-is-deprecated-since-autoconf-2..patch
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Attachment: 0038-runxmlconf-update-to-latest-testsuite-version.patch
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