host-python-pyrex: use the HOST_*_NEEDS_HOST_PYTHON infrastructure

python-pyrex does not support python3.

So, using the *_NEEDS_HOST_PYTHON infrastructure will make sure we won't try
building it for python3. Besides, it will automatically take care of adding the
right host-python package to the dependency list.

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/python-pyrex/python-pyrex.mk

@@ -7,9 +7,9 @@
 PYTHON_PYREX_VERSION = 0.9.9
 PYTHON_PYREX_SOURCE = Pyrex-$(PYTHON_PYREX_VERSION).tar.gz
 PYTHON_PYREX_SITE = http://www.cosc.canterbury.ac.nz/greg.ewing/python/Pyrex/
-PYTHON_PYREX_DEPENDENCIES = host-python
 PYTHON_PYREX_LICENSE = Apache-v2
 PYTHON_PYREX_LICENSE_FILES = LICENSE.txt
 PYTHON_PYREX_SETUP_TYPE = distutils
+HOST_PYTHON_PYREX_NEEDS_HOST_PYTHON = python2
 
 $(eval $(host-python-package))