[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/SBHostOS.cpp

@@ -19,7 +19,7 @@
 #include "lldb/Utility/FileSpec.h"
 
 #include "Plugins/ExpressionParser/Clang/ClangHost.h"
-#ifndef LLDB_DISABLE_PYTHON
+#if LLDB_ENABLE_PYTHON
 #include "Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.h"
 #endif
 
@@ -61,7 +61,7 @@ SBFileSpec SBHostOS::GetLLDBPath(lldb::PathType path_type) {
     fspec = HostInfo::GetHeaderDir();
     break;
   case ePathTypePythonDir:
-#ifndef LLDB_DISABLE_PYTHON
+#if LLDB_ENABLE_PYTHON
     fspec = ScriptInterpreterPython::GetPythonDir();
 #endif
     break;