package/python-sqlalchemy: add cython for python-sqlalchemy

When migrating to setuptools with pep517 support we need to add
host-python-cython which is a pep517 build dependency for
python-sqlalchemy.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Tested-By: Flávio Tapajós <flavio.tapajos@newtesc.com.br>
Signed-off-by: Flávio Tapajós <flavio.tapajos@newtesc.com.br>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

package/python-sqlalchemy/python-sqlalchemy.mk

@@ -12,5 +12,6 @@ PYTHON_SQLALCHEMY_LICENSE = MIT
 PYTHON_SQLALCHEMY_LICENSE_FILES = LICENSE
 PYTHON_SQLALCHEMY_CPE_ID_VENDOR = sqlalchemy
 PYTHON_SQLALCHEMY_CPE_ID_PRODUCT = sqlalchemy
+PYTHON_SQLALCHEMY_DEPENDENCIES = host-python-cython
 
 $(eval $(python-package))