[Bug 262162] ports infrastructure: provide USES_${ARCH}

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262162

            Bug ID: 262162
           Summary: ports infrastructure: provide USES_${ARCH}
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: feature
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: fuz@fuz.su
                CC: koobs@FreeBSD.org

It is currently very awkward to register USES that depend on architecture. 
This is a use case that pops up every once in a while (e.g. when a port
requires a certain build tools only on some architectures).  See e.g. bug
#261247.

This is because USES cannot be set after <bsd.port.pre.mk> is included, but
including that is required to access the ARCH macro.  A possible workaround
is using a construct like

    USES+=${ARCH:Mamd64:S/amd64/something}

but that's hard to read and quite ugly.  As a solution, the ports
infrastructure
should provide a macro USES_${ARCH} that if set is added to USES, permitting
the definition of architecture specific USES.  For example, this could be
achieved by placing

    USES+=${USES_${ARCH}}

after the definition of ARCH and before evaluation of USES in bsd.port.mk.

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