pytz: Add python/host to BUILD_DEPENDS

Buildbots occasionally fail because of this. Travis also seems to try to build this before python.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

lang/python/pytz/Makefile

@@ -9,13 +9,15 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=pytz
 PKG_VERSION:=2018.7
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_LICENSE:=MIT
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://files.pythonhosted.org/packages/source/p/pytz
 PKG_HASH:=31cb35c89bd7d333cd32c5f278fca91b523b0834369e757f4c5641ea252236ca
 
+PKG_BUILD_DEPENDS:=python/host
+
 include $(INCLUDE_DIR)/host-build.mk
 include $(INCLUDE_DIR)/package.mk
 include ../python-package.mk