automake: Disable portability warnings
When they are enabled, autogen.sh fails with loads of warnings on F19. -Wportability used to be automatically disabled with automake <= 1.12 when using silent rules, but this is no longer the case with automake 1.13 which is what fedora 19 uses: http://www.flameeyes.eu/autotools-mythbuster/automake/silent.html "As of version 1.13, though, this opt-in is no longer necessary, as all the Makefiles are generated to support them. The silent-rules option is now a no-op, doing nothing at all, in particular not silencing the portability warnings." This commit disables these warnings in order to avoid autogen.sh breakage because of the use of -Werror, they can be reenabled once gtk-doc.make is fixed to avoid these portability warnings. This patch and commit log is based on a patch from Christophe Fergeau <firstname.lastname@example.org> to spice-gtk.
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