[Bug 228007] math/lapack: switch to flang

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228007

            Bug ID: 228007
           Summary: math/lapack: switch to flang
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: robert.ayrapetyan at gmail.com

Created attachment 193072
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=193072&action=edit
neccessary changes for swithing to flang

There are lot of known problems with gfortran when clang is involved, e.g.:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196862

This patch switches port to flang compiler (on amd64 only) and resolves gcc
linker issues.

Note:
- Added new file: files/flang-patch-make.inc.example
- patched "Makefile" contains a "ditry" arch check, I believe it's the best
available option now until "flang" will be set by default for all amd64 ports
in fortran.mk.

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