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Flexisip RPM:Don't invoke make directly, let the user do it manually. We should make this the default since the way make passes arguments seems to provoke weirdness

Progress commit on flexisip rpm builder. This iteration builds a functional RPM but withtout some features (push, protobuf, ...)

Use CMAKE_TOOLCHAIN_FILE to specify toolchain and add LINPHONE_BUILDER_CONFIG_FILE option to specify the build configuration to use.

- Define build configurations
- Generate autotools config sites dynamically