File warnings.patch of Package libthai

--- src/thinp/thinp.c
+++ src/thinp/thinp.c
@@ -10,6 +10,7 @@
 #include <thai/tis.h>
 #include <thai/wtt.h>
 
+#include <string.h>
 
 int th_isaccept(thchar_t c1, thchar_t c2, thstrict_t s)
 {
--- src/thrend/thrend.c
+++ src/thrend/thrend.c
@@ -9,6 +9,7 @@
 #include <thai/thctype.h>
 #include <thai/tis.h>
 
+#include <string.h>
 
 typedef struct {
     thglyph_t ShiftDown_TONE_AD[8];