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-paramiko/Makefile

@@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=python-paramiko
 PKG_VERSION:=2.12.0
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PYPI_NAME:=paramiko
 PKG_HASH:=376885c05c5d6aa6e1f4608aac2a6b5b0548b1add40274477324605903d9cd49
@@ -15,8 +15,6 @@ include ../pypi.mk
 include $(INCLUDE_DIR)/package.mk
 include ../python3-package.mk
 
-PYTHON3_PKG_SETUP_ARGS:=
-
 define Package/python3-paramiko
   SECTION:=lang
   CATEGORY:=Languages