[lldb/lua] Force Lua version to be 5.3

Due to CMake cache, find_package in FindLuaAndSwig.cmake
will be ignored. This commit adds EXACT and REQUIRED flags
to it and removes find_package in Lua ScriptInterpreter.

Signed-off-by: Siger Yang <sigeryeung@gmail.com>

Reviewed By: tammela, JDevlieghere

Differential Revision: https://reviews.llvm.org/D108515

lldb/cmake/modules/FindLuaAndSwig.cmake

@@ -9,7 +9,7 @@ if(LUA_LIBRARIES AND LUA_INCLUDE_DIR AND SWIG_EXECUTABLE)
 else()
   find_package(SWIG 3.0)
   if (SWIG_FOUND)
-    find_package(Lua 5.3)
+    find_package(Lua 5.3 EXACT)
     if(LUA_FOUND AND SWIG_FOUND)
       mark_as_advanced(
         LUA_LIBRARIES

lldb/source/Plugins/ScriptInterpreter/Lua/CMakeLists.txt

@@ -1,5 +1,3 @@
-find_package(Lua REQUIRED)
-
 add_lldb_library(lldbPluginScriptInterpreterLua PLUGIN
   Lua.cpp
   ScriptInterpreterLua.cpp