Fix MyGUI include dir, and properly return error codes

CI/before_script.msvc.sh

@@ -372,8 +372,7 @@ fi
 MYGUI_SDK="`real_pwd`/MyGUI"
 
 add_cmake_opts -DMYGUISDK="$MYGUI_SDK" \
-	-DMYGUI_INCLUDE_DIRS="$MYGUI_SDK/include" \
-	-DMYGUI_PLATFORM_INCLUDE_DIRS="$MYGUI_SDK/include/MYGUI" \
+	-DMYGUI_INCLUDE_DIRS="$MYGUI_SDK/include/MYGUI" \
 	-DMYGUI_PREQUEST_FILE="$MYGUI_SDK/include/MYGUI/MyGUI_Prerequest.h"
 
 if [ $CONFIGURATION == "Debug" ]; then

CI/build.msvc.sh

@@ -50,6 +50,10 @@ else
 	msbuild OpenMW.sln //t:Build //m:8 //logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
 fi
 
-if [ ! -z $PACKAGE ]; then
+RET=$?
+if [ $RET -eq 0 ] && [ ! -z $PACKAGE ]; then
 	msbuild PACKAGE.vcxproj //t:Build //m:8
-fi
+	RET=$?
+fi
+
+exit $RET