Remove unnecessary instantiations

include/fmt/core.h

@@ -455,15 +455,6 @@ struct convert_to_int {
   };
 };
 
-#define FMT_DISABLE_CONVERSION_TO_INT(Type) \
-  template <typename Char> \
-  struct convert_to_int<Type, Char> { enum { value = 0 }; }
-
-// Silence warnings about convering float to int.
-FMT_DISABLE_CONVERSION_TO_INT(float);
-FMT_DISABLE_CONVERSION_TO_INT(double);
-FMT_DISABLE_CONVERSION_TO_INT(long double);
-
 template <typename Char>
 struct string_value {
   const Char *value;