gitlab-ci: terminate all msys2 related processes before Windows/Aarch…

…64 jobs.

This is the command suggest by MSYS2 developers here:
msys2/MSYS2-packages#4340 (comment)

They also say to run it outside the MSYS2 environment, which is why it's in the
CI rules, not in the shell script.

.gitlab-ci.yml

@@ -688,7 +688,7 @@ deps-win-a64:
     - if ($stuck -eq "True") {
         Remove-Item -Force -Path "C:\msys64\var\lib\pacman\db.lck";
         Write-Output "Cleaned previous stuck pacman" }
-    - Start-Job -ScriptBlock{sleep 90; taskkill /t /F /IM "pacman.exe"}
+    - taskkill /F /FI "MODULES eq msys-2.0.dll"
     - C:\msys64\usr\bin\bash -lc "bash -x ./build/windows/gitlab-ci/1_build-deps-msys2.sh"
   retry: 2
   artifacts:
@@ -725,7 +725,7 @@ gimp-win-a64:
     # Temporary patch until we use the latest LLVM.
     - git apply ./build/windows/patches/0001-clang-rc-files-fix.patch
     - git apply ./build/windows/patches/0004-clang-windres.patch
-    - Start-Job -ScriptBlock{sleep 90; taskkill /t /F /IM "pacman.exe"}
+    - taskkill /F /FI "MODULES eq msys-2.0.dll"
     - C:\msys64\usr\bin\bash -lc "bash -x ./build/windows/gitlab-ci/2_build-gimp-msys2.sh"
   retry: 2
   artifacts:
@@ -762,7 +762,7 @@ packaging-win-a64:
     - if ($stuck -eq "True") {
         Remove-Item -Force -Path "C:\msys64\var\lib\pacman\db.lck";
         Write-Output "Cleaned previous stuck pacman" }
-    - Start-Job -ScriptBlock{sleep 90; taskkill /t /F /IM "pacman.exe"}
+    - taskkill /F /FI "MODULES eq msys-2.0.dll"
     - C:\msys64\usr\bin\bash -lc "bash -x ./build/windows/gitlab-ci/3_package-gimp-uni_base.sh"
     - cd gimp-a64
     - C:\msys64\usr\bin\bash -lc "bash -x ../build/windows/gitlab-ci/3_package-gimp-uni_sym.sh"