Revert "Revert "I had recently added a new SBFrame::GetVariables() overload with yet another bool argument""

Reverting this commit led to other failures which I did not see at
first.  This turned out to be an easy problem to fix, so I added
SBVariablesOptions.cpp to the CMakeLists.txt.  In the future please
try to make sure new files are added to CMake.

llvm-svn: 229516
diff --git a/lldb/source/API/CMakeLists.txt b/lldb/source/API/CMakeLists.txt
index edc7639..cba6806 100644
--- a/lldb/source/API/CMakeLists.txt
+++ b/lldb/source/API/CMakeLists.txt
@@ -58,6 +58,7 @@
   SBTypeSynthetic.cpp
   SBValue.cpp
   SBValueList.cpp
+  SBVariablesOptions.cpp
   SBWatchpoint.cpp
   SBUnixSignals.cpp
   )