src/md5.c: Fix prototype of Transform for GCC 15

Symptom was:
> md5.c: In function 'MD5Update':
> md5.c:121:7: error: too many arguments to function 'Transform'
>   121 |       Transform (mdContext->buf, in);
>       |       ^~~~~~~~~
> md5.c:38:13: note: declared here
>    38 | static void Transform ();
>       |             ^~~~~~~~~
> md5.c: In function 'MD5Final':
> md5.c:151:3: error: too many arguments to function 'Transform'
>   151 |   Transform (mdContext->buf, in);
>       |   ^~~~~~~~~
> md5.c:38:13: note: declared here
>    38 | static void Transform ();
>       |             ^~~~~~~~~

Author: hartwork

src/md5.c

@@ -35,7 +35,7 @@
 #include "md5.h"
 
 /* forward declaration */
-static void Transform ();
+static void Transform (UINT4 *buf, UINT4 *in);
 
 static unsigned char PADDING[64] = {
   0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,