Update vlog parser to handle new output format

Re #2812, the parser now takes a second pass through the output using an
updated regex.

ale_linters/verilog/vlog.vim

@@ -24,6 +24,20 @@ function! ale_linters#verilog#vlog#Handle(buffer, lines) abort
         \})
     endfor
 
+    "Matches patterns like the following:
+    "** Warning: (vlog-2623) add.v(7): Undefined variable: C.
+    "** Error: (vlog-13294) file.v(1): Identifier must be declared with a port mode: C.
+    " let l:pattern = '^**\s\(\w*\):[a-zA-Z0-9\-\.\_\/ ]\+(\(\d\+\)):\s\+\(.*\)'
+    let l:pattern = '^**\s\(\w*\):\s\([^)]*)\)[a-zA-Z0-9\-\.\_\/ ]\+(\(\d\+\)):\s\+\(.*\)'
+
+    for l:match in ale#util#GetMatches(a:lines, l:pattern)
+        call add(l:output, {
+        \   'lnum': l:match[3] + 0,
+        \   'type': l:match[1] is? 'Error' ? 'E' : 'W',
+        \   'text': l:match[2] . " " . l:match[4],
+        \})
+    endfor
+
     return l:output
 endfunction