updated for version 7.3.619

Problem:    When executing a shell command Vim may become slow to respond.
Solution:   Don't wait after every processed message. (idea by Yasuhiro
            Matsumoto)

src/os_win32.c

@@ -3319,6 +3319,8 @@ mch_system_classic(char *cmd, int options)
 	    {
 		TranslateMessage(&msg);
 		pDispatchMessage(&msg);
+		delay = 1;
+		continue;
 	    }
 	    if (WaitForSingleObject(pi.hProcess, delay) != WAIT_TIMEOUT)
 		break;

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    619,
 /**/
     618,
 /**/