Let's see if we can't get AppVeyor to work

CI/before_script.msvc.sh

@@ -20,6 +20,14 @@ while [ $# -gt 0 ]; do
 		-u )
 			UNITY_BUILD=true ;;
 
+		-p )
+			PLATFORM=$1
+			shift ;;
+
+		-c )
+			CONFIGURATION=$1
+			shift ;;
+
 		* )
 			echo "Unknown arg $ARG."
 			exit 1 ;;

appveyor.yml

@@ -40,7 +40,7 @@ cache:
 clone_folder: C:\projects\openmw
 
 before_build:
-    - cmd: sh PLATFORM=%PLATFORM% %APPVEYOR_BUILD_FOLDER%\CI\before_script.msvc.sh -u
+    - cmd: sh %APPVEYOR_BUILD_FOLDER%\CI\before_script.msvc.sh -u -p %PLATFORM%
 
 build_script:
     - cmd: if %PLATFORM%==Win32 set build=Build_32