Add missing cstddef include in assumptions.h

TheCharlatan · TheCharlatan · commit b202b3dd6393 · 2023-03-23T12:52:08.000+01:00
The inclusion of this header should not depend on the inclusion of other
headers that include cstddef themselves.
diff --git a/src/compat/assumptions.h b/src/compat/assumptions.h
@@ -8,6 +8,7 @@
 #ifndef BITCOIN_COMPAT_ASSUMPTIONS_H
 #define BITCOIN_COMPAT_ASSUMPTIONS_H
 
+#include <cstddef>
 #include <limits>
 
 // Assumption: We assume that the macro NDEBUG is not defined.
