python3: drop unneeded multiprocessing module patch

pthread has been merged into the main libc library
(and was never separate in musl), so separate linking
for it is no longer needed.

I ran the reproducing sequence on qemux86, qemux86_64 and same targets with musl,
and it went fine:

root@qemux86:~# python3
Python 3.10.0 (default, Oct  4 2021, 17:55:55) [GCC 11.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import multiprocessing
>>> pool_sema = multiprocessing.BoundedSemaphore(value=1)
>>> pool_sema.acquire()
True
>>> pool_sema.release()
>>>

(From OE-Core rev: 2eabd3b611f4afa5eafa4490b6b0ef7578b742de)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python3_3.10.1.bb

@@ -25,7 +25,6 @@ SRC_URI = "http://www.python.org/ftp/python/${PV}/Python-${PV}.tar.xz \
            file://0001-Use-FLAG_REF-always-for-interned-strings.patch \
            file://0001-test_locale.py-correct-the-test-output-format.patch \
            file://0017-setup.py-do-not-report-missing-dependencies-for-disa.patch \
-           file://0001-setup.py-pass-missing-libraries-to-Extension-for-mul.patch \
            file://0001-Makefile-do-not-compile-.pyc-in-parallel.patch \
            file://0020-configure.ac-setup.py-do-not-add-a-curses-include-pa.patch \
            file://0001-Skip-failing-tests-due-to-load-variability-on-YP-AB.patch \