crypto: remove polarssl wrapper

This is not even in the build system anymore.

common/rfbcrypto_polarssl.c

@@ -1,26 +0,0 @@
-#include <string.h>
-#include <polarssl/md5.h>
-#include <polarssl/sha1.h>
-#include "rfbcrypto.h"
-
-void digestmd5(const struct iovec *iov, int iovcnt, void *dest)
-{
-    md5_context c;
-    int i;
-    
-    md5_starts(&c);
-    for (i = 0; i < iovcnt; i++)
-	md5_update(&c, iov[i].iov_base, iov[i].iov_len);
-    md5_finish(&c, dest);
-}
-
-void digestsha1(const struct iovec *iov, int iovcnt, void *dest)
-{
-    sha1_context c;
-    int i;
-    
-    sha1_starts(&c);
-    for (i = 0; i < iovcnt; i++)
-	sha1_update(&c, iov[i].iov_base, iov[i].iov_len);
-    sha1_finish(&c, dest);
-}