package/ci: maybe with deprecated APIs off WinRT builds in under an hour?

Shit buildsystem, shit compiler, shit STL. How THE FUCK is it possible
that just switching from MSBUILD.EXE to Ninja makes the build >2x
faster. How!?

package/ci/appveyor-rt.bat

@@ -22,6 +22,7 @@ cmake .. ^
     -DCORRADE_WITH_PLUGINMANAGER=OFF ^
     -DCORRADE_WITH_TESTSUITE=OFF ^
     -DCORRADE_WITH_UTILITY=OFF ^
+    -DCORRADE_BUILD_DEPRECATED=OFF ^
     -G Ninja || exit /b
 cmake --build . --target install || exit /b
 cd .. || exit /b
@@ -35,6 +36,7 @@ cmake .. ^
     -DCORRADE_RC_EXECUTABLE=%APPVEYOR_BUILD_FOLDER%/deps-native/bin/corrade-rc.exe ^
     -DCORRADE_WITH_INTERCONNECT=OFF ^
     -DCORRADE_BUILD_STATIC=ON ^
+    -DCORRADE_BUILD_DEPRECATED=OFF ^
     -G "%GENERATOR%" -A x64 || exit /b
 cmake --build . --config Release --target install -- /m /v:m || exit /b
 cd .. || exit /b
@@ -67,6 +69,7 @@ cmake .. ^
     -DMAGNUM_TARGET_GLES2=%TARGET_GLES2% ^
     -DMAGNUM_BUILD_TESTS=ON ^
     -DMAGNUM_BUILD_STATIC=ON ^
+    -DMAGNUM_BUILD_DEPRECATED=OFF ^
     -G "%GENERATOR%" -A x64 || exit /b
 cmake --build . --config Release -- /m /v:m || exit /b