Enables building compressed Windows test builds with --pack option.

Tools/msi/build.bat

@@ -7,6 +7,7 @@ set BUILDX86=
 set BUILDX64=
 set BUILDDOC=
 set BUILDPX=
+set BUILDPACK=
 
 :CheckOpts
 if "%~1" EQU "-h" goto Help
@@ -14,6 +15,7 @@ if "%~1" EQU "-x86" (set BUILDX86=1) && shift && goto CheckOpts
 if "%~1" EQU "-x64" (set BUILDX64=1) && shift && goto CheckOpts
 if "%~1" EQU "--doc" (set BUILDDOC=1) && shift && goto CheckOpts
 if "%~1" EQU "--test-marker" (set BUILDPX=1) && shift && goto CheckOpts
+if "%~1" EQU "--pack" (set BUILDPACK=1) && shift && goto CheckOpts
 
 if not defined BUILDX86 if not defined BUILDX64 (set BUILDX86=1) && (set BUILDX64=1)
 
@@ -41,6 +43,9 @@ set BUILD_CMD="%D%bundle\snapshot.wixproj"
 if defined BUILDPX (
     set BUILD_CMD=%BUILD_CMD% /p:UseTestMarker=true
 )
+if defined BUILDPACK (
+    set BUILD_CMD=%BUILD_CMD% /p:Pack=true
+)
 
 if defined BUILDX86 (
     "%PCBUILD%win32\python.exe" "%D%get_wix.py"
@@ -56,9 +61,10 @@ if defined BUILDX64 (
 exit /B 0
 
 :Help
-echo build.bat [-x86] [-x64] [--doc] [-h] [--test-marker]
+echo build.bat [-x86] [-x64] [--doc] [-h] [--test-marker] [--pack]
 echo.
 echo    -x86                Build x86 installers
 echo    -x64                Build x64 installers
 echo    --doc               Build CHM documentation
 echo    --test-marker       Build installers with 'x' markers
+echo    --pack              Embed core MSIs into installer

Tools/msi/bundle/snapshot.wixproj

@@ -9,9 +9,14 @@
     <Import Project="..\msi.props" />
 
     <PropertyGroup>
+        <DefineConstants Condition="'$(Pack)' != 'true'">
+            $(DefineConstants);CompressMSI=no;
+        </DefineConstants>
+        <DefineConstants Condition="'$(Pack)' == 'true'">
+            $(DefineConstants);CompressMSI=yes;
+        </DefineConstants>
         <DefineConstants>
             $(DefineConstants);
-            CompressMSI=no;
             CompressPDB=no;
             CompressMSI_D=no;
         </DefineConstants>