fix test for glob* function compatibility

- not all versions of vim 7.2 support the extra argument for glob*(),
  only those compiled with patch 51

autoload/vundle/installer.vim

@@ -134,7 +134,9 @@ endf
 
 func! vundle#installer#clean(bang) abort
   let bundle_dirs = map(copy(g:bundles), 'v:val.path()') 
-  let all_dirs = v:version >= 702 ? split(globpath(g:bundle_dir, '*', 1), "\n") : split(globpath(g:bundle_dir, '*'), "\n")
+  let all_dirs = (v:version > 702 || (v:version == 702 && has("patch51")))
+  \   ? split(globpath(g:bundle_dir, '*', 1), "\n")
+  \   : split(globpath(g:bundle_dir, '*'), "\n")
   let x_dirs = filter(all_dirs, '0 > index(bundle_dirs, v:val)')
 
   if empty(x_dirs)
@@ -187,7 +189,7 @@ endf
 func! s:has_doc(rtp) abort
   return isdirectory(a:rtp.'/doc')
   \   && (!filereadable(a:rtp.'/doc/tags') || filewritable(a:rtp.'/doc/tags'))
-  \   && v:version >= 702
+  \   && (v:version > 702 || (v:version == 702 && has("patch51")))
   \     ? !(empty(glob(a:rtp.'/doc/*.txt', 1)) && empty(glob(a:rtp.'/doc/*.??x', 1)))
   \     : !(empty(glob(a:rtp.'/doc/*.txt')) && empty(glob(a:rtp.'/doc/*.??x')))
 endf