package/python3-cryptography: add python3 host variant

Add a python3 host variant since another downstream OSS component
(OP-TEE) uses buildroot and it will depend on a python3 host variant
of python-cryptography.

Signed-off-by: Donald Chan <hoiho@lab126.com>
[yann.morin.1998@free.fr:
  - drop target _DEPENDENCIES since this is a host-only package
  - instead, add host-openssl to dependencies
  - add CPE variables
  - also add sync comment for python-pip
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/python-cryptography/python-cryptography.mk

@@ -4,6 +4,7 @@
 #
 ################################################################################
 
+# Please keep in sync with package/python3-cryptography/python3-cryptography.mk
 PYTHON_CRYPTOGRAPHY_VERSION = 3.0
 PYTHON_CRYPTOGRAPHY_SOURCE = cryptography-$(PYTHON_CRYPTOGRAPHY_VERSION).tar.gz
 PYTHON_CRYPTOGRAPHY_SITE = https://files.pythonhosted.org/packages/bf/ac/552fc8729d90393845cc3a2062facf4a89dcbe206fa78771d60ddaae7554

package/python3-cryptography/python3-cryptography.hash

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

package/python3-cryptography/python3-cryptography.mk

@@ -0,0 +1,24 @@
+################################################################################
+#
+# python3-cryptography
+#
+################################################################################
+
+# Please keep in sync with package/python-cryptography/python-cryptography.mk
+PYTHON3_CRYPTOGRAPHY_VERSION = 3.0
+PYTHON3_CRYPTOGRAPHY_SOURCE = cryptography-$(PYTHON3_CRYPTOGRAPHY_VERSION).tar.gz
+PYTHON3_CRYPTOGRAPHY_SITE = https://files.pythonhosted.org/packages/bf/ac/552fc8729d90393845cc3a2062facf4a89dcbe206fa78771d60ddaae7554
+PYTHON3_CRYPTOGRAPHY_SETUP_TYPE = setuptools
+PYTHON3_CRYPTOGRAPHY_LICENSE = Apache-2.0 or BSD-3-Clause
+PYTHON3_CRYPTOGRAPHY_LICENSE_FILES = LICENSE LICENSE.APACHE LICENSE.BSD
+PYTHON3_CRYPTOGRAPHY_CPE_ID_VENDOR = cryptography_project
+PYTHON3_CRYPTOGRAPHY_CPE_ID_PRODUCT = cryptography
+HOST_PYTHON3_CRYPTOGRAPHY_DL_SUBDIR = python-cryptography
+HOST_PYTHON3_CRYPTOGRAPHY_NEEDS_HOST_PYTHON = python3
+HOST_PYTHON3_CRYPTOGRAPHY_DEPENDENCIES = \
+	host-openssl \
+	host-python3-cffi \
+	host-python3-pip \
+	host-python3-six
+
+$(eval $(host-python-package))