Fix include directory for system utf8proc.

--- netsurf-3.10/utils/idna.c
+++ netsurf-3.10/utils/idna.c
@@ -167,7 +167,7 @@
 
 #ifdef WITH_UTF8PROC
 
-#include <libutf8proc/utf8proc.h>
+#include <utf8proc.h>
 
 int32_t idna_contexto[] = {
 	/* CONTEXTO codepoints which have a rule defined */
>
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