package/ci: GitHub says I can't use git:// anymore.

I kinda get the point, to avoid rogue third parties tainting my
ŕepositories with nasty backdoors, yes, but unless *everything* on the
way to the server including DNS queries is encrypted, then it's still
just a half of the solution and any silly corporate firewall can still
prevent me from cloning stuff from github dot com.

package/ci/appveyor-desktop-gles.bat

@@ -14,7 +14,7 @@ ninja install || exit /b
 cd .. && cd ..
 
 rem Build Corrade
-git clone --depth 1 git://github.com/mosra/corrade.git || exit /b
+git clone --depth 1 https://github.com/mosra/corrade.git || exit /b
 cd corrade || exit /b
 mkdir build && cd build || exit /b
 cmake .. ^
@@ -32,7 +32,7 @@ cmake --build . --target install || exit /b
 cd .. && cd ..
 
 rem Build Magnum
-git clone --depth 1 git://github.com/mosra/magnum.git || exit /b
+git clone --depth 1 https://github.com/mosra/magnum.git || exit /b
 cd magnum || exit /b
 mkdir build && cd build || exit /b
 cmake .. ^
@@ -65,7 +65,7 @@ cmake --build . --target install || exit /b
 cd .. && cd ..
 
 rem Build Magnum Plugins
-git clone --depth 1 git://github.com/mosra/magnum-plugins.git || exit /b
+git clone --depth 1 https://github.com/mosra/magnum-plugins.git || exit /b
 cd magnum-plugins || exit /b
 mkdir build && cd build || exit /b
 cmake .. ^

package/ci/appveyor-desktop.bat

@@ -16,7 +16,7 @@ ninja install || exit /b
 cd .. && cd ..
 
 rem Build Corrade
-git clone --depth 1 git://github.com/mosra/corrade.git || exit /b
+git clone --depth 1 https://github.com/mosra/corrade.git || exit /b
 cd corrade || exit /b
 mkdir build && cd build || exit /b
 cmake .. ^
@@ -34,7 +34,7 @@ cmake --build . --target install || exit /b
 cd .. && cd ..
 
 rem Build Magnum
-git clone --depth 1 git://github.com/mosra/magnum.git || exit /b
+git clone --depth 1 https://github.com/mosra/magnum.git || exit /b
 cd magnum || exit /b
 mkdir build && cd build || exit /b
 cmake .. ^
@@ -65,7 +65,7 @@ cmake --build . --target install || exit /b
 cd .. && cd ..
 
 rem Build Magnum Plugins
-git clone --depth 1 git://github.com/mosra/magnum-plugins.git || exit /b
+git clone --depth 1 https://github.com/mosra/magnum-plugins.git || exit /b
 cd magnum-plugins || exit /b
 mkdir build && cd build || exit /b
 cmake .. ^

package/ci/unix-desktop-gles.sh

@@ -2,7 +2,7 @@
 set -ev
 
 # Corrade
-git clone --depth 1 git://github.com/mosra/corrade.git
+git clone --depth 1 https://github.com/mosra/corrade.git
 cd corrade
 mkdir build && cd build
 cmake .. \
@@ -18,7 +18,7 @@ ninja install
 cd ../..
 
 # Magnum
-git clone --depth 1 git://github.com/mosra/magnum.git
+git clone --depth 1 https://github.com/mosra/magnum.git
 cd magnum
 mkdir build && cd build
 cmake .. \
@@ -49,7 +49,7 @@ ninja install
 cd ../..
 
 # Magnum Plugins
-git clone --depth 1 git://github.com/mosra/magnum-plugins.git
+git clone --depth 1 https://github.com/mosra/magnum-plugins.git
 cd magnum-plugins
 mkdir build && cd build
 cmake .. \

package/ci/unix-desktop.sh

@@ -2,7 +2,7 @@
 set -ev
 
 # Corrade
-git clone --depth 1 git://github.com/mosra/corrade.git
+git clone --depth 1 https://github.com/mosra/corrade.git
 cd corrade
 mkdir build && cd build
 cmake .. \
@@ -19,7 +19,7 @@ ninja install
 cd ../..
 
 # Magnum
-git clone --depth 1 git://github.com/mosra/magnum.git
+git clone --depth 1 https://github.com/mosra/magnum.git
 cd magnum
 mkdir build && cd build
 cmake .. \
@@ -56,7 +56,7 @@ ninja install
 cd ../..
 
 # Magnum Plugins
-git clone --depth 1 git://github.com/mosra/magnum-plugins.git
+git clone --depth 1 https://github.com/mosra/magnum-plugins.git
 cd magnum-plugins
 mkdir build && cd build
 cmake .. \