[REM] packaging: remove useless winpy_requirements.txt file

As this file was only used as a one shot for the windows pacakging, it
can be removed from the code.

closes odoo/odoo#55307

X-original-commit: 19b44653fef85a851239c656b1fdf4798ab83f34
Signed-off-by: Christophe Monniez (moc) <moc@odoo.com>

setup/win32/winpy_requirements.txt

-Babel==2.3.4
-decorator==4.0.10
-docutils==0.12
-ebaysdk==2.1.4
-feedparser==5.2.1
-gevent>=1.1.2
-greenlet>=0.4.10
-html2text==2016.9.19
-Jinja2==2.10.1
-lxml>=3.5.0
-Mako==1.0.4
-MarkupSafe==0.23
-mock==2.0.0
-num2words==0.5.4
-ofxparse==0.16
-passlib==1.6.5
-Pillow>=3.4.1
-polib>=1.1.0
-psutil>=4.3.1
-psycopg2==2.7.1
-pydot==1.2.3
-pyparsing==2.1.10
-PyPDF2==1.26.0
-pyserial==3.1.1
-python-dateutil==2.5.3
-pytz==2016.7
-pyusb==1.0.0
-qrcode==5.3
-reportlab>=3.3.0
-requests==2.20.0
-six==1.10.0
-stdnum==1.8
-zeep==3.1.0
-vobject==0.9.3
-Werkzeug>=0.11.11
-XlsxWriter==0.9.3
-xlwt==1.3.*
-xlrd==1.0.0