[lldb] Fix linux build when LLDB_ENABLE_PYTHON is OFF

Remove 'lldb-python-scripts' from LLVM_DISTRIBUTION_COMPONENTS when
Python scripting is disabled. Otherwise we get

```
Specified distribution component 'lldb-python-scripts' doesn't have an install target
```

Author: AnthonyLatsis

lldb/cmake/modules/LLDBConfig.cmake

@@ -71,7 +71,9 @@ add_optional_dependency(LLDB_ENABLE_LIBEDIT "Enable editline support in LLDB" Li
 add_optional_dependency(LLDB_ENABLE_CURSES "Enable curses support in LLDB" CursesAndPanel CURSESANDPANEL_FOUND)
 add_optional_dependency(LLDB_ENABLE_LZMA "Enable LZMA compression support in LLDB" LibLZMA LIBLZMA_FOUND)
 add_optional_dependency(LLDB_ENABLE_LUA "Enable Lua scripting support in LLDB" LuaAndSwig LUAANDSWIG_FOUND)
-add_optional_dependency(LLDB_ENABLE_PYTHON "Enable Python scripting support in LLDB" PythonAndSwig PYTHONANDSWIG_FOUND)
+# Python is needed to generate SBLanguages.h from Dwarf.def, so we cannot just
+# skip it as a dependency if LLDB_ENABLE_PYTHON is false.
+add_optional_dependency(ON "Enable Python scripting support in LLDB" PythonAndSwig PYTHONANDSWIG_FOUND)
 add_optional_dependency(LLDB_ENABLE_LIBXML2 "Enable Libxml 2 support in LLDB" LibXml2 LIBXML2_FOUND VERSION ${LLDB_LIBXML2_VERSION})
 add_optional_dependency(LLDB_ENABLE_FBSDVMCORE "Enable libfbsdvmcore support in LLDB" FBSDVMCore FBSDVMCore_FOUND QUIET)
 
@@ -215,6 +217,15 @@ else()
   # Even if Python scripting is disabled, we still need a Python interpreter to
   # build, for example to generate SBLanguages.h.
   find_package(Python3 COMPONENTS Interpreter REQUIRED)
+
+  # Remove lldb-python-scripts from distribution components.
+  # LLVM_DISTRIBUTION_COMPONENTS is set in a cache where LLDB_ENABLE_PYTHON does
+  # not yet have a value. We have to touch up LLVM_DISTRIBUTION_COMPONENTS after
+  # the fact.
+  if(LLVM_DISTRIBUTION_COMPONENTS)
+    list(REMOVE_ITEM LLVM_DISTRIBUTION_COMPONENTS lldb-python-scripts)
+    set(LLVM_DISTRIBUTION_COMPONENTS ${LLVM_DISTRIBUTION_COMPONENTS} CACHE STRING "" FORCE)
+  endif()
 endif()
 
 if (LLVM_EXTERNAL_CLANG_SOURCE_DIR)