[Bug 274595] net-p2p/monero-cli: new build option added

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274595

            Bug ID: 274595
           Summary: net-p2p/monero-cli: new build option added
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: tonidasbabes88@gmail.com
                CC: fuz@FreeBSD.org

Created attachment 245744
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=245744&action=edit
Git patch

By default this port builds with the -march=native compiler flag. This is
defined upstream. This setting makes sense for those who intend to use the
software to mine but has virtually no benefit for those who simply want to use
it as a node. However, it causes problems to whoever is building ports on a
dedicated system to use on other systems with different CPUs. In that case the
port may not run normally (a few seconds after the monerod service starts a
monerod.core files is created and it up to roughly the size of the database and
then the service quits). 

I fixed this issue by creating a new option PORTABLE where the user can choose
whether to build portable binaries that will work other systems of the same
architecture but different CPUs by removing the -march=native compiler flag.
The flag is removed by applying a patch to the CMakeLists.txt upstream file
similar to what is done to compile on OpenBSD. Probably this is not the most
elegant solution but, with my very limited knowledge, that's the best I could
come up with.

If you have any suggestions on how to improve this I'd appreciate the input.

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