Fix msys2 not installing any packages because it can't find clang (#6655)

util/msys2_install.sh

@@ -8,7 +8,7 @@ installflip=false
 util_dir=$(dirname "$0")
 
 echo "Installing dependencies needed for the installation (quazip)"
-pacman --needed -S base-devel mingw-w64-x86_64-toolchain msys/clang msys/git msys/p7zip msys/python3 msys/unzip
+pacman --needed -S base-devel mingw-w64-x86_64-toolchain mingw-w64-x86_64-clang msys/git msys/p7zip msys/python3 msys/unzip
 
 source "$dir/win_shared_install.sh"