Update build#dir() to configure coc-clangd

autoload/build.vim

@@ -37,8 +37,10 @@ function! build#dir(...) abort
   if exists('l:dir')
     " Set build directory and restart YouCompleteMe.
     let $BUILD_DIR = getcwd().'/'.substitute(l:dir, '\/$', '', '')
-    let g:ycm_clangd_args = ['--compile-commands-dir='.$BUILD_DIR]
-    YcmRestartServer
+    " TODO: Check .vim/coc-settings.json exists, create it if not
+    let l:coc_settings = json_decode(join(readfile('.vim/coc-settings.json'), ''))
+    let l:coc_settings['clangd.compilationDatabasePath'] = $BUILD_DIR
+    CocRestart
   endif
 endfunction