[Bug 220319] math/R: Added the option to support the flang fortran

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220319

            Bug ID: 220319
           Summary: math/R: Added the option to support the flang fortran
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: jrm at freebsd.org
          Reporter: yuri at rawbw.com
          Assignee: jrm at freebsd.org
             Flags: maintainer-feedback?(jrm at freebsd.org)

Created attachment 183864
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=183864&action=edit
patch

This patch:
* Adds GFORTRAN and FLANG options
  - The FLANG option takes advantage of the newly proposed fortran:flang
argument to build with llvm-based flang instead of the gcc-based gfortran
* Adds the patch patch-configure to prevent the configuration failure due to
configure script expecting G77 fortran, test for which flang fails for some
reason
  - This should probably be reported either upstream to flang, or upstream to
R, depending on if flang is or isn't expected to be G77
* Adds the patch patch-src_main_complex.c because cpow and clog functions are
missing for some reason with flang

Builds in poudriere. Passes simple tests.

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