Moved #include for lldb-python.h to a distinct group with a reminder comment

declaring that it must be first.  Failure to do so results in build failures
on macOS due to subtle header conflicts.

llvm-svn: 279315

lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp

@@ -13,7 +13,9 @@
 
 #else
 
+// LLDB Python header must be included first
 #include "lldb-python.h"
+
 #include "ScriptInterpreterPython.h"
 #include "PythonDataObjects.h"
 #include "PythonExceptionState.h"