[Bug 204615] bsd.port.mk: USE_LINUX as build-only dependency

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204615

            Bug ID: 204615
           Summary: bsd.port.mk: USE_LINUX as build-only dependency
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: needs-patch
          Severity: Affects Only Me
          Priority: ---
         Component: Ports Framework
          Assignee: portmgr at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
                CC: freebsd-ports-bugs at FreeBSD.org

USE_LINUX assumes anything built by a linux toolchain targets linuxulator. In
some cases a port may want to build either for native (e.g. using proprietary
toolchain) or for unsupported ABI (e.g. FreeBSD<->device bridge).

To fix maybe extend the syntax to allow arguments (similar to USES) e.g.,

  USE_LINUX= yes:build
  USE_LINUX= c6_64:build

to avoid hacks like in devel/fb-adb:

  BUILD_DEPENDS=  ${LINUX_BASE_PORT}

  USE_LINUX=      yes

  .include <bsd.port.mk>

  .if defined(.PARSEDIR)
  RUN_DEPENDS:=   ${RUN_DEPENDS:N${LINUX_BASE_PORT}}
  .else
  RUN_DEPENDS:=   ${RUN_DEPENDS:N*linux_base*}
  .endif

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