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[Gedare Bloom]

This patch adds a macro to ease writing a configuration when the user
does not care about resource limits / determinism. Such a case arises
frequently when porting software to RTEMS when the precise resource
requirements of the software is unknown. By allowing users to declare
all resources as being unlimited the user will be able to easily avoid
having to identify which resources are included and define the resource
limits.

I tested this patch only with the unlimited sample, which uses unlimited
tasks. The other classic resources and posix resources have not been tested
to verify that they will work properly when using unlimited objects. Due
to how the posix objects' memory requirements are configured in confdefs
this patch does not provide unlimited declarations for posix keys or
queued signals.

If a user provides a value for a configured number of resources that
value will be used instead of the unlimited. If a user does not specify
an allocation size the default size of 8 objects is used. This macro does not
support varying the allocation sizes for different objects; users who want that
much control can define the unlimited macros themselves.