support patch-releases in helper.pl

helper.pl

@@ -276,8 +276,8 @@ sub patch_makefile {
 
 sub version_form_tomcrypt_h {
   my $h = read_file(shift);
-  if ($h =~ /\n#define\s*SCRYPT\s*"([0-9]+)\.([0-9]+)"/s) {
-    return "VERSION=$1.$2", "VERSION_LT=0:$1$2";
+  if ($h =~ /\n#define\s*SCRYPT\s*"([0-9]+)\.([0-9]+)\.([0-9]+).*"/s) {
+    return "VERSION=$1.$2.$3", "VERSION_LT=0:$1$2";
   }
   else {
     die "#define SCRYPT not found in tomcrypt.h";