Add some documentation (why do we need wine from winehq)?

.github/workflows/compile_maxima64.yml

@@ -18,6 +18,9 @@ jobs:
              sudo dpkg --add-architecture i386
              sudo apt-get update
              sudo apt-get install g++-mingw-w64-x86-64 cmake nsis automake texlive texlive-plain-generic texlive-xetex rsync p7zip-full g++ gettext python3 tcl pandoc po4a libgcc-s1:i386 libstdc++6:i386 bsdutils wget
+      # compiling the Maxima installer with CCL64 requires a recent wine installation (from winehq)...
+      # If you do not include CCL64 (omit -DWITH_CCL64=YES during the configure step), the wine
+      # installation from the Ubuntu repository is good (see the 32 bit procedure)
       - name: install wine from winehq
         run: |
              # already done: sudo dpkg --add-architecture i386