Move some compile-time dispatch to runtime

The runtime performance is likely to be negligible,
but compile times need every improvement they can get.

CMakeLists.txt

@@ -204,6 +204,7 @@ set(IMPL_SOURCES
         ${HEADER_DIR}/internal/catch_context.cpp
         ${HEADER_DIR}/internal/catch_debugger.cpp
         ${HEADER_DIR}/internal/catch_errno_guard.cpp
+        ${HEADER_DIR}/internal/catch_evaluate.cpp
         ${HEADER_DIR}/internal/catch_exception_translator_registry.cpp
         ${HEADER_DIR}/internal/catch_fatal_condition.cpp
         ${HEADER_DIR}/internal/catch_list.cpp