icf files use cpp syntax

vimrc

@@ -98,6 +98,7 @@ if has("autocmd")
     autocmd FileType xml setlocal sw=2 ts=2 sts=2
     autocmd FileType yaml setlocal sw=2 ts=2 sts=2
     autocmd FileType text setlocal textwidth=78
+    autocmd BufRead,BufNewFile *.icf set syntax=cpp
 
     " When editing a file, always jump to the last known cursor position.
     " Don't do it when the position is invalid or when inside an event handler