Update the Windows packaging script.

As discussed on:
  https://discourse.llvm.org/t/build-llvm-release-bat-script-options/63146/6

Giving:
  call :function if errorlevel 1 exit /b 1

Due to a missing new line, the error code returned by the function
is taking as another argument.

Changed to use standard '||' to exit if the errorlevel greater than zero.

  call :function || exit /b 1

Reviewed By: hans

Differential Revision: https://reviews.llvm.org/D130154

llvm/utils/release/build_llvm_release.bat

@@ -106,8 +106,8 @@ REM Preserve original path
 set OLDPATH=%PATH%
 
 REM Build the 32-bits and/or 64-bits binaries.
-call :do_build_32 if errorlevel 1 exit /b 1
-call :do_build_64 if errorlevel 1 exit /b 1
+call :do_build_32 || exit /b 1
+call :do_build_64 || exit /b 1
 exit /b 0
 
 ::==============================================================================