[PATCH] Migrate Python bindings installation script from distutils to setuptools, attempt 2

Apologies for my initial failed attempt, I made a number of blunders in 
my first patch.

This second patch:

* Only modifies the CMake build system (the previous changes to 
Autotools was the result of me patching more than was necessary)
* Uses correct indentation (I had spaces and tabs confused before, now 
I'm using tabs correctly)
* Successfully applies against the head of SVN and against the 1.9.0 tarball
* Successfully builds against the 1.9.0 tarball (I haven't tried 
building SVN with this yet)
* Switches the Python setup script embedded in the CMake system from 
using distutils to using setuptools
* Adds a SWORD_PYTHON_INSTALL_ROOT build option for allowing the Python 
bindings to be installed without building a Python egg (works around 
https://github.com/pypa/setuptools/issues/3143)
* Has the patch as an attachment since it appears either GMail or 
Thunderbird potentially mangled my patch last time

As before, everything in the patch is made available under GPLv2.

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--- a/bindings/swig/python/CMakeLists.txt	2023-10-02 20:55:56.264801835 -0500
+++ b/bindings/swig/python/CMakeLists.txt	2023-10-02 20:59:53.103289769 -0500
@@ -25,7 +25,7 @@
 
 SET(PY_SCRIPT "#!${PYTHON_EXECUTABLE}
 
-from distutils.core import setup, Extension
+from setuptools import setup, Extension
 setup(
     name='sword',
     version='${SWORD_VERSION}',
@@ -51,8 +51,11 @@
 	WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
 
 # Allow user installation to custom directory
+IF(NOT SWORD_PYTHON_INSTALL_ROOT STREQUAL "")
+	SET(SETUP_ARGS "\"--root=${SWORD_PYTHON_INSTALL_ROOT}\"")
+ENDIF(NOT SWORD_PYTHON_INSTALL_ROOT STREQUAL "")
 IF(NOT SWORD_PYTHON_INSTALL_DIR STREQUAL "")
-	SET(SETUP_ARGS "\"--prefix=${SWORD_PYTHON_INSTALL_DIR}\"")
+	SET(SETUP_ARGS "${SETUP_ARGS}\"--prefix=${SWORD_PYTHON_INSTALL_DIR}\"")
 ENDIF(NOT SWORD_PYTHON_INSTALL_DIR STREQUAL "")
 CONFIGURE_FILE("${CMAKE_CURRENT_SOURCE_DIR}/install.cmake.in"
 	       "${CMAKE_CURRENT_BINARY_DIR}/install.cmake")