[Bug 268422] math/atlas alapack is not a full lapack after update to 3.10.3

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268422

            Bug ID: 268422
           Summary: math/atlas alapack is not a full lapack after update
                    to 3.10.3
           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: alt2600@icloud.com

Created attachment 238852
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=238852&action=edit
git-Makefile_full_lapack.diff

So ran into some issues after Atlas update with some errors indicating missing
symbols notably from py-numpy when configuring opencv, or py-netCDF4

ImportError:
/usr/local/lib/python3.9/site-packages/numpy/linalg/_umath_linalg.cpython-39.so:
Undefined symbol "sgesdd_"

so after poking around the backup package of Atlas and the current ones I
confirmed the old one did provide that symbol, and I recall that becoming
default a while ago to build full lapack. 

So I starting digging and saw what upstream did with eliminating specifying
just the static library reference to use. I basically manually did in the
do-build section things that configure would have done if if had built its own
lapack.a and set it up to use it. This included passing some options to
xconfig, stripping some objects from our reference lapack and copying it into
${opt}/lib where the build expects it. it appears passing flapack to xconfig
doesn't really do anything, all the business setting things up now seems to be
in configure, but can be worked around.

I confirmed this now provides the library, opencv doesn't fail to import the
symbol loading numpy, all the things that use atlas build. I even re-built
py-scipy with atlas using this:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257400 and the scikit
packages I have that use it.

I've attached my patch

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