[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/API/SystemInitializerFull.cpp

@@ -10,7 +10,7 @@
 #include "lldb/API/SBCommandInterpreter.h"
 #include "lldb/Host/Config.h"
 
-#if !defined(LLDB_DISABLE_PYTHON)
+#if LLDB_ENABLE_PYTHON
 #include "Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.h"
 #endif
 
@@ -179,11 +179,11 @@ llvm::Error SystemInitializerFull::Initialize() {
 
   ScriptInterpreterNone::Initialize();
 
-#ifndef LLDB_DISABLE_PYTHON
+#if LLDB_ENABLE_PYTHON
   OperatingSystemPython::Initialize();
 #endif
 
-#if !defined(LLDB_DISABLE_PYTHON)
+#if LLDB_ENABLE_PYTHON
   ScriptInterpreterPython::Initialize();
 #endif
 
@@ -375,7 +375,7 @@ void SystemInitializerFull::Terminate() {
   DynamicLoaderStatic::Terminate();
   DynamicLoaderWindowsDYLD::Terminate();
 
-#ifndef LLDB_DISABLE_PYTHON
+#if LLDB_ENABLE_PYTHON
   OperatingSystemPython::Terminate();
 #endif