Fix build failure on gcc-9. It's a slightly less invasive
version of upstream's commit 2dce85ed06a8cc7ca
("[icu] Remove HB_ICU_STMT (#1993)")
--- a/src/hb-icu.cc
+++ b/src/hb-icu.cc
@@ -53,7 +53,7 @@
 
 /* ICU doesn't do-while(0) around their statements.  Ugh!
  * https://unicode-org.atlassian.net/browse/CLDR-13027 */
-#define HB_ICU_STMT(S) do { S } while (0)
+#define HB_ICU_STMT(S) do { S; } while (0)
 
 hb_script_t
 hb_icu_script_to_script (UScriptCode script)