Appveyor: Cleaned up cygwin 32-bit envs

Details:

* Updated notes in appveyor.yml why 32-bit cygwin with Python 2.7 does
  not work. Most recent symptom is that M2Crypto does not install with
  raising:

  OSError: Unknown format of swig -version output.

* Changed order of 32-bit vs 64-bit cygwin envs in appveyor.yml.

Note that tox.ini was already in sync with appveyor.yml.

Signed-off-by: Andreas Maier <andreas.r.maier@gmx.de>

appveyor.yml

@@ -55,8 +55,10 @@ environment:
 
 # Note: On CygWin with Python 3.x, LC_ALL/LANG need to be set to utf-8 for Click to install/work
 
-# TODO: Disabled because python2.7 with cygwin 32-bit fails with:
-#       "virtualenv is not compatible with this system or executable"
+# Note: The 32-bit version of CygWin fails with Python 2.7 and has therefore
+# been disabled. There have been different symptoms over time, including:
+# - "virtualenv is not compatible with this system or executable".
+# - M2Crypto installation raises "OSError: Unknown format of swig -version output"
 #    - TOX_ENV: cygwin32_py27
 #      UNIX_PATH: C:\cygwin\bin
 #      PYTHON_CMD: python2.7

tox.ini

@@ -167,26 +167,26 @@ basepython = python2.7
 platform = cygwin
 basepython = python2.7
 
-[testenv:cygwin64_py36]
+[testenv:cygwin32_py36]
 platform = cygwin
 basepython = python3.6
 
-[testenv:cygwin32_py36]
+[testenv:cygwin64_py36]
 platform = cygwin
 basepython = python3.6
 
-[testenv:cygwin64_py37]
+[testenv:cygwin32_py37]
 platform = cygwin
 basepython = python3.7
 
-[testenv:cygwin32_py37]
+[testenv:cygwin64_py37]
 platform = cygwin
 basepython = python3.7
 
-[testenv:cygwin64_py38]
+[testenv:cygwin32_py38]
 platform = cygwin
 basepython = python3.8
 
-[testenv:cygwin32_py38]
+[testenv:cygwin64_py38]
 platform = cygwin
 basepython = python3.8