Fix Installer: Disabling ASLR for the Igor process was never applied

The powershell script uses the Set-ProcessMitigation CmdLet.
However, when calling powershell.exe from the 32-bit installer the 32-bit
powershell is started and it does not support the CmdLet.

This commit fixes this by explicitly calling the 64 bit powershell executable.

Author: MichaelHuth

tools/installer/installer.nsi

@@ -852,7 +852,8 @@ SkipVCRedistInstallation:
 
   IntCmp $ISADMIN 0 SkipASLRSetup
     IntCmp $XOPINST 0  SkipASLRSetup
-      ExecWait 'Powershell.exe -executionPolicy bypass -File "$INSTDIR\Packages\ITCXOP2\tools\Disable-ASLR-for-Igor64.ps1"' $0
+      # This special execution is required because we need to run 64-bit powershell here
+      ExecWait '$WINDIR\sysnative\windowspowershell\v1.0\powershell.exe -executionPolicy bypass -File "$INSTDIR\Packages\ITCXOP2\tools\Disable-ASLR-for-Igor64.ps1"' $0
       IntCmp $0 0 SkipASLRSetup
         IfSilent +2
           MessageBox MB_OK "Can not disable ASLR for Igor64.exe."