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If we can include ACGCommon, use acg_add_library, otherwise behave normally. doc installation needs to be fixed

This reverts commit c6595acd.

This didn't make a difference with OLD CMP0042 behaviour, but with NEW
behaviour we really need to set this in some cases for fixup_bundle to
work.

handle STL_VECTOR_CHECKS in ACGCommon, dont use ACGCompiler anymore; set INCLUDE_TEMPLATES per-target