[cpack_installer] couple small fixes to installer Jenkins scripts

scripts/build/Platform/Windows/build_windows.cmd

@@ -38,11 +38,10 @@ IF NOT EXIST %TMP% (
 REM Compute half the amount of processors so some jobs can run
 SET /a HALF_PROCESSORS = NUMBER_OF_PROCESSORS / 2
 
-IF %CMAKE_INCLUDE_WIX%=="True" (
+IF "%CMAKE_INCLUDE_WIX%"=="True" (
     REM Explicitly enable wix via command line arg for forensic logging
     SET EXTRA_CMAKE_OPTIONS=%EXTRA_CMAKE_OPTIONS% -DLY_WIX_PATH="%WIX%"
-)
-ELSE (
+) ELSE (
     REM Disable implicit enabling of windows packing by clearing out the wix variable
     SET WIX=
 )

scripts/build/Platform/Windows/installer_windows.cmd

@@ -22,6 +22,9 @@ PUSHD %OUTPUT_DIRECTORY%
 
 REM Override the temporary directory used by wix to the EBS volume
 SET "WIX_TEMP=!WORKSPACE!/temp/wix"
+IF NOT EXIST "%WIX_TEMP%" (
+    MKDIR %WIX_TEMP%
+)
 
 REM Run cpack
 ECHO [ci_build] cpack -C %CONFIGURATION%