[Bug 254234] multimedia/arcan: fix build on aarch64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254234

            Bug ID: 254234
           Summary: multimedia/arcan: fix build on aarch64
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
               URL: http://ampere2.nyi.freebsd.org/data/main-arm64-default
                    /p568049_s15565e0a21/logs/errors/arcan-0.6.0.1_3.log
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: jbeich at FreeBSD.org
          Reporter: mikael at FreeBSD.org
          Assignee: jbeich at FreeBSD.org
             Flags: maintainer-feedback?(jbeich at FreeBSD.org)

Created attachment 223201
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=223201&action=edit
v0

Remove march=native compiler flag as it breaks building on aarch64:

error:
pkg-static: Unable to access file
/wrkdirs/usr/ports/multimedia/arcan/work/stage/usr/local/bin/afsrv_encode:No
such file or directory

due to (make configure): (encode) disabled, lzma not found

In CMakeError.log: 
Determining if the function lzma_auto_decoder exists in the /usr/lib/liblzma.so
failed with the following output:
c++: error: the clang compiler does not support '-march=native'

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