Move aom_ports build commands into aom_ports/aom_ports.cmake.
- Stop abuse of the aom_util target to expose aom_ports includes to IDEs. - Create aom_ports target only on appropriate platforms. - Otherwise add the include only sources to the libaom target (aka abuse the libaom target instead of the aom_util target). BUG=https://bugs.chromium.org/p/aomedia/issues/detail?id=76 Change-Id: I82a27a0fc2d6ab13ea273726a4777e21ebdbd247
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