Require SIGNTOOL to sign instead of NOSIGNTOOL to not sign.

build.bat

@@ -52,7 +52,7 @@ echo - Setup.exe
 if exist .\setup-sign.bat (
   call .\setup-sign.bat
 ) else (
-  files\iscc setup.iss /q /DNOSIGNTOOL
+  files\iscc setup.iss /q
 )
 if errorlevel 1 goto failed
 echo - Renaming files

setup.iss

@@ -30,7 +30,7 @@ TouchDate=none
 TouchTime=00:00
 WizardImageFile=compiler:WizModernImage-IS.bmp
 WizardSmallImageFile=compiler:WizModernSmallImage-IS.bmp
-#ifndef NOSIGNTOOL
+#ifdef SIGNTOOL
 SignTool=issigntool
 SignTool=issigntool256
 SignedUninstaller=yes