The std::terminate function is declared in the <exception> header, so we need
to include it in the non-exception case.

Upstream-Status: https://github.com/tcbrindle/span/pull/53

diff --git a/include/tcb/span.hpp b/include/tcb/span.hpp
index 8efcddb..96aaef5 100644
--- a/include/tcb/span.hpp
+++ b/include/tcb/span.hpp
@@ -27,6 +27,8 @@ http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/n4820.pdf
 #ifndef TCB_SPAN_NO_EXCEPTIONS
 #include <cstdio>
 #include <stdexcept>
+#else
+#include <exception> // for std::terminate
 #endif
 
 // Various feature test macros
-- 
2.54.0