ci: Add ci/install.bat

Move the MinGW package installation commands from ci/build.sh into
ci/install.sh.

.appveyor.yml

@@ -9,7 +9,8 @@ image:
 clone_depth: 5
 
 install:
-  - sh: 'ci/install.sh'
+  - sh:  'ci/install.sh'
+  - cmd: 'ci\install.bat'
 
 build_script:
   - sh:  'ci/build.sh'

ci/build.sh

@@ -9,15 +9,6 @@ configure_options=(
 
 case "$(uname)" in
     MSYS*|MINGW*)
-	pacman --noconfirm --remove mingw-w64-x86_64-gcc-ada
-	pacman --noconfirm --remove mingw-w64-x86_64-gcc-fortran
-	pacman --noconfirm --remove mingw-w64-x86_64-gcc-libgfortran
-	pacman --noconfirm --remove mingw-w64-x86_64-gcc-objc
-	pacman --noconfirm --sync --refresh
-	pacman --noconfirm --sync --needed diffutils
-	pacman --noconfirm --sync --needed make
-	pacman --noconfirm --sync --needed mingw-w64-x86_64-gcc
-	pacman --noconfirm --sync --needed mingw-w64-x86_64-cunit
 	export PATH="/mingw64/bin:$PATH"
 	configure_options+=(--disable-shared)
 	;;

ci/install.bat

@@ -0,0 +1 @@
+C:\msys64\usr\bin\bash --login -c 'set -x; cd "${APPVEYOR_BUILD_FOLDER}"; ci/install.sh'

ci/install.sh

@@ -14,4 +14,15 @@ case "$(uname)" in
 	;;
     Darwin)
 	;;
+    MSYS*|MINGW*)
+	pacman --noconfirm --remove mingw-w64-x86_64-gcc-ada
+	pacman --noconfirm --remove mingw-w64-x86_64-gcc-fortran
+	pacman --noconfirm --remove mingw-w64-x86_64-gcc-libgfortran
+	pacman --noconfirm --remove mingw-w64-x86_64-gcc-objc
+	pacman --noconfirm --sync --refresh
+	pacman --noconfirm --sync --needed diffutils
+	pacman --noconfirm --sync --needed make
+	pacman --noconfirm --sync --needed mingw-w64-x86_64-gcc
+	pacman --noconfirm --sync --needed mingw-w64-x86_64-cunit
+	;;
 esac