fix(lua): make core vim module not dependent on $VIMRUNTIME functions

fixes #15524

Note: this is obviously a quickfix. A scalabe solution will
involve being able to specify a _list_ of modules to be
put into packages.preload, without needing to manually copypasta
a blurb of C code. Perhaps even involving bytecode for
static builds (to speedup initialization)

src/nvim/lua/vim.lua

@@ -642,6 +642,4 @@ vim._expand_pat_get_parts = function(lua_string)
   return parts, search_index
 end
 
-pcall(require, 'vim._meta')
-
 return module