clang-interpreter example cmake fix

[LukeCheeseman]

Summary

Add in a space when appending the export to the linker options. Without
the space the export is appeneded onto whatever the last link option
was, which might be a file.

[marsupial]

Sorry 'bout that...
(CMake and quoting make dull boys)

[LukeCheeseman]

closed by https://reviews.llvm.org/rC328092

examples/clang-interpreter/CMakeLists.txt

target_link_libraries(clang-interpreter
   )
 
 export_executable_symbols(clang-interpreter)
 
 if (MSVC)
   # Is this a CMake bug that even with export_executable_symbols, Windows
   # needs to explictly export the type_info vtable
   set_property(TARGET clang-interpreter
-               APPEND_STRING PROPERTY LINK_FLAGS /EXPORT:??_7type_info@@6B@)
+               APPEND_STRING PROPERTY LINK_FLAGS " /EXPORT:??_7type_info@@6B@")
 endif()
 
 function(clang_enable_exceptions TARGET)
   # Really have to jump through hoops to enable exception handling independent
   # of how LLVM is being built.
   if (NOT LLVM_REQUIRES_EH AND NOT LLVM_REQUIRES_RTTI)
     if (MSVC)
       # /EHs to allow throwing from extern "C"