[Open-scap] Stubbed draft of Local Variable evaluation

[David Niemoller]

The attached patch includes a stubbed draft of the implementation of
local variable evaluation.  The new code includes

-- an implementation of oval_variable_get_values which includes the
just-in-time evaluation of local variable values.

-- A new function oval_component_evaluate(struct oval_component *,
struct oval_string_map *) that is tasked with generating the oval_values
that result from evaluating an oval_component (FUNCTION,
VARIABLE_REFERENCE, OBJECT_REFERENCE) on the host platform.  The
oval_values generated for the specified oval_component are indexed by
their text values in the specified oval_string_map (the oval_string_map
behaves like a set in this operation).

Other changes noted in the patch include changes that support ANSI and
enforce a consistent path style for .h references.
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