config: add disable_Werror config option
Add a disable_Werror configuration option (default True) which causes --disable-Werror to be passed to each automake build. Support for this switch was recently added to AX_COMPILER_FLAGS as a way to unconditionally disable all fatal warnings. By default, -Werror is enabled for builds done out of git (which is what jhbuild spends most of its time doing). The idea is to prevent -Werror from ruining the day for people who simply want to use jhbuild as a mechanism to build the latest version of GNOME, while allowing advanced users to re-enable the feature (and also maintaining -Werror for those who do manual git checkouts). In the case that the module doesn't know about this switch, it will be safely ignored.
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