[lldb/CMake] Rename LLDB_DISABLE_PYTHON to LLDB_ENABLE_PYTHON

This matches the naming scheme used by LLVM and all the other optional
dependencies in LLDB.

Differential revision: https://reviews.llvm.org/D71482

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

@@ -11,11 +11,7 @@
 
 #include "lldb/Host/Config.h"
 
-#ifdef LLDB_DISABLE_PYTHON
-
-// Python is disabled in this build
-
-#else
+#if LLDB_ENABLE_PYTHON
 
 #include "lldb/Breakpoint/BreakpointOptions.h"
 #include "lldb/Core/IOHandler.h"
@@ -62,5 +58,5 @@ protected:
 };
 } // namespace lldb_private
 
-#endif // LLDB_DISABLE_PYTHON
+#endif // LLDB_ENABLE_PYTHON
 #endif // LLDB_PLUGINS_SCRIPTINTERPRETER_PYTHON_SCRIPTINTERPRETERPYTHON_H