🍒 [lldb] Add build option to specify the libxml 2 version (llvm#142183)

The Swift Windows toolchain uses its own static build of libxml 2, which
is more recent than 2.8, resulting in the provided libxml 2 to be
rejected. This change allows to specify a custom version for libxml 2,
while defaulting to 2.8.

(cherry-picked from commit llvm/llvm-project@a080c74)

Author: Steelskin

lldb/cmake/modules/LLDBConfig.cmake

@@ -51,6 +51,11 @@ macro(add_optional_dependency variable description package found)
   message(STATUS "${description}: ${${variable}}")
 endmacro()
 
+set(LLDB_LIBXML2_VERSION "2.8" CACHE STRING
+  "Specify the version of libxml 2 to use with LLDB. This is only meant to be overridden for local
+  static builds of libxml 2. Use at your own risk.")
+mark_as_advanced(LLDB_LIBXML2_VERSION)
+
 add_optional_dependency(LLDB_ENABLE_SWIG "Enable SWIG to generate LLDB bindings" SWIG SWIG_FOUND VERSION 4)
 
 # BEGIN SWIFT MOD
@@ -67,7 +72,7 @@ add_optional_dependency(LLDB_ENABLE_CURSES "Enable curses support in LLDB" Curse
 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)
-add_optional_dependency(LLDB_ENABLE_LIBXML2 "Enable Libxml 2 support in LLDB" LibXml2 LIBXML2_FOUND VERSION 2.8)
+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)
 
 option(LLDB_USE_ENTITLEMENTS "When codesigning, use entitlements if available" ON)