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autotools: add various compiler warning flags and enable -Werror for CI

Christoph Reiter requested to merge warn-flags into master

The first commit integrates AX_COMPILER_FLAGS() and passes the warning flags to all code which we have control over and enables -Werror on CI. It also disables all warnings which trigger with AX_APPEND_COMPILE_FLAGS() to make the build on CI pass.

The followup commits enable the disabled warnings one by one and fix them.

Edited by Christoph Reiter

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