package/python3-pip: add python3 host variant

Add a python3 host variant since we are adding a python3 host variant of
python-cryptography and it is dependent on this.

Signed-off-by: Donald Chan <hoiho@lab126.com>
[yann.morin.1998@free.fr:
  - add CPE variables
  - also add sync comment for python-pip
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/python-pip/python-pip.mk

@@ -4,6 +4,7 @@
 #
 ################################################################################
 
+# Please keep in sync with package/python3-pip/python3-pip.mk
 PYTHON_PIP_VERSION = 20.0.2
 PYTHON_PIP_SOURCE = pip-$(PYTHON_PIP_VERSION).tar.gz
 PYTHON_PIP_SITE = https://files.pythonhosted.org/packages/8e/76/66066b7bc71817238924c7e4b448abdb17eb0c92d645769c223f9ace478f

package/python3-pip/python3-pip.hash

@@ -0,0 +1 @@
+../python-pip/python-pip.hash

package/python3-pip/python3-pip.mk

@@ -0,0 +1,19 @@
+################################################################################
+#
+# python3-pip
+#
+################################################################################
+
+# Please keep in sync with package/python-pip/python-pip.mk
+PYTHON3_PIP_VERSION = 20.0.2
+PYTHON3_PIP_SOURCE = pip-$(PYTHON_PIP_VERSION).tar.gz
+PYTHON3_PIP_SITE = https://files.pythonhosted.org/packages/8e/76/66066b7bc71817238924c7e4b448abdb17eb0c92d645769c223f9ace478f
+PYTHON3_PIP_SETUP_TYPE = setuptools
+PYTHON3_PIP_LICENSE = MIT
+PYTHON3_PIP_LICENSE_FILES = LICENSE.txt
+PYTHON3_PIP_CPE_ID_VENDOR = pypa
+PYTHON3_PIP_CPE_ID_PRODUCT = pip
+HOST_PYTHON3_PIP_DL_SUBDIR = python-pip
+HOST_PYTHON3_PIP_NEEDS_HOST_PYTHON = python3
+
+$(eval $(host-python-package))