Add missing #include.

--- f252b4d0e6bc54acea9615104c58c0fba965aa3e/src/archivers/chd/corestr.cpp	2024-01-03 22:00:53.000000000 +0000
+++ f252b4d0e6bc54acea9615104c58c0fba965aa3e/src/archivers/chd/corestr.cpp	2025-07-07 13:43:09.100226789 +0100
@@ -15,6 +15,7 @@
 #include <memory>
 
 #include <cctype>
+#include <cstdint>
 #include <cstdlib>