python-setuptools-scm: Add new host-only package

The host build replaces the use of the host pip requirements file. This
also updates the dependants of setuptools-scm to depend on the host
build.

This also removes the toml host pip requirements file as toml is not
used by any other package.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

lang/python/python-jsonschema/Makefile

@@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=python-jsonschema
 PKG_VERSION:=4.17.3
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PYPI_NAME:=jsonschema
 PKG_HASH:=0f864437ab8b6076ba6707453ef8f98a6a0d512a80e93f8abdb676f737ecb60d
@@ -11,7 +11,7 @@ PKG_MAINTAINER:=Javier Marcet <javier@marcet.info>
 PKG_LICENSE:=MIT
 PKG_LICENSE_FILES:=COPYING
 
-HOST_PYTHON3_PACKAGE_BUILD_DEPENDS:=setuptools-scm
+PKG_BUILD_DEPENDS:=python-setuptools-scm/host
 
 include ../pypi.mk
 include $(INCLUDE_DIR)/package.mk