Test update .appveyor.yml to run same steps described in BUILD_MSYS2.md

.appveyor.yml

@@ -33,14 +33,15 @@ install:
   - ps: if (Test-Path Env:\CYG_ROOT) { Start-FileDownload "https://cygwin.com/$env:CYG_SETUP" -FileName "$env:CYG_SETUP" }
   - if defined CYG_ROOT (%CYG_SETUP% --quiet-mode --no-shortcuts --only-site --root "%CYG_ROOT%" --site "%CYG_MIRROR%" --local-package-dir "%CYG_CACHE%" --packages "%CYG_PACKAGES%" --upgrade-also)
   # (temporary?) problem with msys/pacman/objc/ada (see https://github.com/msys2/msys2/wiki/FAQ)
-  - if defined MSYSTEM (%BASH% -lc "pacman -Rns --noconfirm mingw-w64-{i686,x86_64}-gcc-ada mingw-w64-{i686,x86_64}-gcc-objc")
+  #- if defined MSYSTEM (%BASH% -lc "pacman -Rns --noconfirm mingw-w64-{i686,x86_64}-gcc-ada mingw-w64-{i686,x86_64}-gcc-objc")
   # temporary fix for MSYS revoked/new signing keys:
-  - if defined MSYSTEM (%BASH% -lc "curl https://pastebin.com/raw/e0y4Ky9U | bash")
+  #- if defined MSYSTEM (%BASH% -lc "curl https://pastebin.com/raw/e0y4Ky9U | bash")
   - if defined MSYSTEM (%BASH% -lc "pacman -Suuy --noconfirm")
   # the following line is not a duplicate line:
   # it is necessary to upgrade the MSYS base files and after that all the packages
   # the 2 separate commands/lines are required because a new shell is necessary for each step
   - if defined MSYSTEM (%BASH% -lc "pacman -Suuy --noconfirm")
+  - if defined MSYSTEM (%BASH% -lc "pacman -S --needed --noconfirm git make gcc libiconv-devel")
 
 build_script:
   - if defined BASH (%BASH% -lc "cd $(cygpath ${APPVEYOR_BUILD_FOLDER}) && make")