[autotools,bugfix] Fixes documentation building in tarballs.
When unpacking the tarballs, the time stamps are preserved, but the access time of the files might be set differently. In addition during configure Doxyfile is always created. This resulted in some files being newer than the doxygen-tag in the tarball and triggered building the documentation. This patch fixes the problem for me by only checking the modification time and excluding Doxyfile.
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