Remove Python 2 compatibility

I don't have any way of testing that the build works on Python 2, and I
know pathlib doesn't exist there. Probably time to retire it.

Makefile

@@ -134,15 +134,7 @@ install: $(ALL)
 ifeq ($(DESTDIR),)
 	ldconfig
 endif
-	@if which python2; then cd PY_RGPIO && python2 setup.py -q install $(PYINSTALLARGS) || echo "*** install of Python2 rgpio.py failed ***"; fi
 	@if which python3; then cd PY_RGPIO && python3 setup.py -q install $(PYINSTALLARGS) || echo "*** install of Python3 rgpio.py failed ***"; fi
-	@if which swig; then cd PY_LGPIO && swig -python lgpio.i || echo "*** need swig package to install lgpio.py ***"; fi
-	@if which swig python2; then \
-		cd PY_LGPIO && \
-		python2 setup.py build_ext $(PYBUILDARGS) && \
-		python2 setup.py -q install $(PYINSTALLARGS) || \
-		echo "*** install of Python2 lgpio.py failed ***"; \
-	fi
 	@if which swig python3; then \
 		cd PY_LGPIO && \
 		python3 setup.py build_ext $(PYBUILDARGS) && \

PY_LGPIO/setup.py

@@ -26,7 +26,6 @@
        license='unlicense.org',
        keywords=['linux', 'sbc', 'gpio',],
        classifiers=[
-         "Programming Language :: Python :: 2",
          "Programming Language :: Python :: 3",
        ],
        ext_modules = [lgpio_module],

PY_RGPIO/setup.py

@@ -21,7 +21,6 @@
       py_modules=['rgpio'],
       keywords=['linux', 'sbc', 'gpio',],
       classifiers=[
-         "Programming Language :: Python :: 2",
          "Programming Language :: Python :: 3",
       ]
      )