Add missing ffs() declaration for Win32 hosts, by Stefan Weil.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3821 c046a42c-6fe2-441c-8c8c-71466251a162

osdep.h

@@ -56,6 +56,8 @@ void *get_mmap_addr(unsigned long size);
 int qemu_create_pidfile(const char *filename);
 
 #ifdef _WIN32
+int ffs(int i);
+
 typedef struct {
     long tv_sec;
     long tv_usec;