this is necessary for talloc

(cherry picked from commit f075de5)

These options are forcefully added by pkgsStatic but are not understood
by waf.

(cherry picked from commit f23a215)

waf does support --build and --host, but the only effect of these
options is an error message telling to use --cross-compile instead.
So we ignore these flags.

(cherry picked from commit 1001d00)

for this to work, wafHook must be in nativeBuildInputs.

(cherry picked from commit 3d60a00)

(cherry picked from commit cbd9409)

(cherry picked from commit 52566c3)

This avoids the potential conflict between autoconf flags and the waf
flags. There is some overlap between the two but waf errors when it
doesn’t recognize the flag.

(cherry picked from commit a79a8f2)

[19.03] Static proot, wafHook cross compilation

Emacs loads all the elisp files in the top-level of the site-lisp
directory. However some packages (e.g. mu4e) put their elisp files in a
subdirectory of site-lisp. Emacs will not load these packages unless
subdirs.el is present.

This commit links the subdirs.el file from the emacs package into the
emacs-package-deps package so that packages that put their elisp files
in a subdirectory of site-lisp are loaded.

Originally introduced in 8970a9c and 1531b5e, these patches were lost in
efbe87f when the CPython version files were merged, likely due to
CPython 3.7 not needing them anymore. These patches should remain
in-tree until CPython 3.5 and 3.6 support is dropped completely.

Found with the diffoscope ( https://diffoscope.org/ ).

(cherry picked from commit 28ac309)

[19.03] emacs: Link subdirs.el into emacs-packages-deps

(cherry picked from commit 5bcf827)

The AVX512 optimization has a bug in openblas-0.3.5
and can also lead to slower code on Xeon Silver CPUs.

See OpenMathLib/OpenBLAS#1955
and OpenMathLib/OpenBLAS#2029

(cherry picked from commit 7035aa7de4fa8668b6d7feab7b1ed58015689d09)

Signed-off-by: Austin Seipp <aseipp@pobox.com>
(cherry picked from commit 181e971)