make DES3_string_to_key static

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@3539 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/krb5/str2key.c

@@ -223,7 +223,7 @@ fold(const unsigned char *str, size_t len, unsigned char *out)
     memcpy(out, key, size);
 }
 
-void
+static void
 DES3_string_to_key(char *str, size_t len, des_cblock *keys)
 {
     unsigned char tmp[24];