Introduce OS specific cmdline argument handling and move SMB arg to os-posix.c

Introduce OS specific cmdline argument handling by calling
os_parse_cmd_args() at the end of switch() statement. Move option
enum to qemu-options.h and have it included from os-posix.c and
os-win32.c in addition to vl.c.

In addition move SMB argument to os-posix.c

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Acked-by: Juan Quintela <quintela@redhat.com>
Acked-by: Richard Henderson <rth@redhat.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

os-win32.c

@@ -31,6 +31,7 @@
 #include <sys/time.h>
 #include "config-host.h"
 #include "sysemu.h"
+#include "qemu-options.h"
 
 /***********************************************************/
 /* Polling handling */
@@ -204,3 +205,12 @@ char *os_find_datadir(const char *argv0)
     }
     return NULL;
 }
+
+/*
+ * Parse OS specific command line options.
+ * return 0 if option handled, -1 otherwise
+ */
+void os_parse_cmd_args(int index, const char *optarg)
+{
+    return;
+}