Remove unused <ostream> (#157)
`<ostream>` isn't needed unless enum traits are being used, in that case
it will be included by the files that need it. Removing this fixes a
failure for targets that don't have `<ostream>` available.
Fixes: 156
diff --git a/compiler/back_end/cpp/generated_code_templates b/compiler/back_end/cpp/generated_code_templates
index a0acc68..5325852 100644
--- a/compiler/back_end/cpp/generated_code_templates
+++ b/compiler/back_end/cpp/generated_code_templates
@@ -33,7 +33,6 @@
#include <string.h>
#include <algorithm>
-#include <ostream>
#include <type_traits>
#include <utility>
