Log Message:
openblas: update to 0.3.10, fixing build with gcc 10

Fix openblas build issues, mainly by updating to 0.3.10.

This pulls in these commits from WIP (newest first):

commit 3c6284cba90280bc367cf4d1d8252ae4d6e92e76
Author: Jason Bacon <bacon@NetBSD.org>
Date:   Thu Feb 25 11:56:13 2021 -0600

    openblas: Update ONLY_FOR_PLATFORMS documentation

commit 8071bf28f3ffc95af046ff3eaaac6983f4f70035
Author: Jason Bacon <bacon@NetBSD.org>
Date:   Thu Feb 25 11:51:32 2021 -0600

    openblas*: Successful build on NetBSD

commit 056e3d5c972a4b286e8755dbee323a9951855165
Author: Dr. Thomas Orgis <thomas.orgis@uni-hamburg.de>
Date:   Wed Feb 24 18:40:17 2021 +0100

    openblas: flags from environment again to un-break PICy build

    The bug that prompted us to force the compiler flags in the
    make arguments is fixed. Now we got a different one: The logic
    that decides to add -fPIC where needed is overridden when doing
    this, resulting in relocation errors (strangely, not with every
    toolchain).

    So let's remove that again and take FFLAGS and friends from the
    environment again.

commit 86af17db8526e629c2c02c6af1f1ce7db6f6ba6d
Author: Dr. Thomas Orgis <thomas.orgis@uni-hamburg.de>
Date:   Thu Nov 12 12:44:39 2020 +0100

    openblas: version 0.3.10

    This updated fixes the build with gcc 10 (segfault in cblat1 test).

    I did not go all the way to the current 0.3.12, as that would
    need some hacking of chosen compiler flags. 0.3.13 should be
    the next one.

    This commit also fixes the ARCH → ARCH_ sed to change all
    occurences on a line.

This fulfills pkg/55999 and was approved by wiz during freeze.