Adding icl to compile wrapper script

Hello automake developers,

I have this patch which adds icl (Windows Intel Compiler) to the lib/compile wrapper script.  Icl has a Visual Studio driver interface and supports all the flags that are translated inside the compile script.  It also doesn't support the '-o -c' idiom similar to the Visual Studio compiler so I think it is a good candidate for this wrapper script.

-- Johnny

diff --git a/lib/compile b/lib/compile
index 69fad9c..8a7013e 100755
--- a/lib/compile
+++ b/lib/compile
@@ -258,6 +258,9 @@ EOF
   cl | *[/\\]cl | cl.exe | *[/\\]cl.exe )
     func_cl_wrapper "$@"      # Doesn't return...
     ;;
+  icl | *[/\\]icl | icl.exe | *[/\\]icl.exe )
+    func_cl_wrapper "$@"      # Doesn't return...
+    ;;
 esac
 
 ofile=