python-packages: Clean up build variables

* Rename PYTHON3_PKG_SETUP_VARS to PYTHON3_PKG_BUILD_VARS, and
  PYTHON3_PKG_SETUP_DIR to PYTHON3_PKG_BUILD_PATH

  The new variable names emphasize that these values apply to the new
  build process.

* Remove PYTHON3_PKG_SETUP_ARGS set to the empty string

  These were set to override the default arguments in the old build
  process and not applicable to the new build process.

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

lang/python/python-cryptodomex/Makefile

@@ -6,7 +6,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=python-cryptodomex
 PKG_VERSION:=3.10.1
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PYPI_NAME:=pycryptodomex
 PKG_HASH:=541cd3e3e252fb19a7b48f420b798b53483302b7fe4d9954c947605d0a263d62
@@ -19,8 +19,7 @@ include ../pypi.mk
 include $(INCLUDE_DIR)/package.mk
 include ../python3-package.mk
 
-PYTHON3_PKG_SETUP_ARGS:=
-PYTHON3_PKG_SETUP_VARS:= \
+PYTHON3_PKG_BUILD_VARS:= \
   CONFIG_BIG_ENDIAN="$(CONFIG_BIG_ENDIAN)"
 
 define Package/python3-cryptodomex