Fix non-PCH build

PCH builds include more headers, so missing includes can escape
detection.

Fixes: 047ddaf9ea ("Prevent buffer overrun in removeext")

common/include/strutil.h

@@ -12,6 +12,7 @@
 #include <cstring>
 #include "dxxsconf.h"
 #include "dsx-ns.h"
+#include "compiler-array.h"
 #include <vector>
 
 namespace dcx {