base64: Make base64_encode declaration consistent with its definition

Signed-off-by: Anders Kaseorg <andersk@mit.edu>

src/crypto/base64.cc

@@ -35,6 +35,7 @@
 #include <openssl/evp.h>
 
 #include "fatal_assert.h"
+#include "base64.h"
 
 bool base64_decode( const char *b64, const size_t b64_len,
 		    char *raw, size_t *raw_len )

src/crypto/base64.h

@@ -33,5 +33,5 @@
 bool base64_decode( const char *b64, const size_t b64_len,
 		    char *raw, size_t *raw_len );
 
-bool base64_encode( const char *raw, const size_t raw_len,
+void base64_encode( const char *raw, const size_t raw_len,
-		    char *b64, size_t b64_len );
+		    char *b64, const size_t b64_len );