Revert "python,python3: add zlib/host to HOST_BUILD_DEPENDS"

This reverts commit c764f77dc1.

The commit caused warnings to be displayed at make defconfig etc.
  WARNING: Makefile 'package/feeds/packages/python/python/Makefile'
  has a host build dependency on 'zlib/host' but
  'package/libs/zlib/Makefile' does not implement a 'host' build type

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

lang/python/python/Makefile

@@ -14,7 +14,7 @@ PKG_NAME:=python
 PKG_VERSION:=$(PYTHON_VERSION).$(PYTHON_VERSION_MICRO)
 # XXX: reset PKG_RELEASE to 1 only if Python's pip & setuptools versions have also bumped;
 #      otherwise, keep bumping PKG_RELEASE
-PKG_RELEASE:=6
+PKG_RELEASE:=5
 
 PKG_SOURCE:=Python-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=https://www.python.org/ftp/python/$(PKG_VERSION)
@@ -42,7 +42,7 @@ PKG_CONFIG_DEPENDS:= \
 	CONFIG_PYTHON_BLUETOOTH_SUPPORT
 
 PKG_BUILD_DEPENDS:=python/host
-HOST_BUILD_DEPENDS:=bzip2/host expat/host zlib/host
+HOST_BUILD_DEPENDS:=bzip2/host expat/host
 
 include $(INCLUDE_DIR)/host-build.mk
 include $(INCLUDE_DIR)/package.mk

lang/python/python3/Makefile

@@ -16,7 +16,7 @@ PYTHON_VERSION_MICRO:=$(PYTHON3_VERSION_MICRO)
 PKG_NAME:=python3
 # XXX: reset PKG_RELEASE to 1 only if Python's pip & setuptools versions have also bumped;
 #      otherwise, keep bumping PKG_RELEASE
-PKG_RELEASE:=12
+PKG_RELEASE:=11
 PKG_VERSION:=$(PYTHON_VERSION).$(PYTHON_VERSION_MICRO)
 
 PKG_SOURCE:=Python-$(PKG_VERSION).tar.xz
@@ -45,7 +45,7 @@ PKG_CONFIG_DEPENDS:= \
 	CONFIG_PYTHON3_BLUETOOTH_SUPPORT
 
 PKG_BUILD_DEPENDS:=python3/host
-HOST_BUILD_DEPENDS:=bzip2/host expat/host libffi/host zlib/host
+HOST_BUILD_DEPENDS:=bzip2/host expat/host libffi/host
 
 include $(INCLUDE_DIR)/host-build.mk
 include $(INCLUDE_DIR)/package.mk