[oe] [patch] cross keyword for automake warnings

[Alexander Stohr]

each of the following two patches adds the "cross" keyword to the command line option --warnings of the automake utility.

that feature is merely a dummy right now as it's not yet used by the tool.
it improves consistency for the commandline parameters of the tools from that sector.
it further helps the oe build to not fail when e.g. a tool from the
autoconf collection blindly tries to pass along "--warnings=cross" to automake.

consider this as a systematic change that paves the way for more whilst reducing need for complexity (like filtering that) in the callers area.

two versions are appended.
i only ran the one for 1.10.x on my build testbed.

regards, Alex.
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