FindLua{50,51}: Fix finding headers in standard distros

`find_path` already knows how to search in `<prefix>/include` directories.
We need `PATH_SUFFIXES` only for the `/lua*` subdirectory.

Fixes: #26855

Modules/FindLua50.cmake

@@ -32,7 +32,7 @@ locations other than lua/
 find_path(LUA_INCLUDE_DIR lua.h
   HINTS
     ENV LUA_DIR
-  PATH_SUFFIXES include/lua50 include/lua5.0 include/lua5 include/lua include
+  PATH_SUFFIXES lua50 lua5.0 lua5 lua
   PATHS
   ~/Library/Frameworks
   /Library/Frameworks

Modules/FindLua51.cmake

@@ -36,7 +36,7 @@ cmake_policy(SET CMP0159 NEW) # file(STRINGS) with REGEX updates CMAKE_MATCH_<n>
 find_path(LUA_INCLUDE_DIR lua.h
   HINTS
     ENV LUA_DIR
-  PATH_SUFFIXES include/lua51 include/lua5.1 include/lua-5.1 include/lua include
+  PATH_SUFFIXES lua51 lua5.1 lua-5.1 lua
   PATHS
   ~/Library/Frameworks
   /Library/Frameworks