Add missing semicolon to fix build with icu 65.1

--- src/lib/libfreehand_utils.cpp.orig	2019-10-08 21:05:45.546891345 +0200
+++ src/lib/libfreehand_utils.cpp	2019-10-08 21:06:34.700922635 +0200
@@ -162,7 +162,7 @@
   while (j < length)
   {
     UChar32 c;
-    U16_NEXT(s, j, length, c)
+    U16_NEXT(s, j, length, c);
     unsigned char outbuf[U8_MAX_LENGTH+1];
     int i = 0;
     U8_APPEND_UNSAFE(&outbuf[0], i, c);