CI: Skip tags build on GHA

Currently, the workflow is executed both on branches and tags push.
No need to execute on tags push.

make clean didn't clean directories

appveyor: Update for 7.4.1106

Don't rename libintl-8.dll to libintl.dll.

Update for 7.4.1104

appveyor: Stop installing scheme-lib

appveyor: Remove goto

appveyor: Disable loading Racket's DLL

Loading Racket's DLL on AppVeyor causes 0xc0000005 error. However the
same executable doesn't cause the error on non-AppVeyor environment.
Disable loading Racket's DLL on AppVeyor for now.

Check cl.exe's version

temp

appveyor: raco --auto