[C] Remove unused types from choice sets.

Author: denizevrenci

sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/c/CGenerator.java

@@ -681,27 +681,6 @@ private void generateChoiceSet(final CharSequence[] scope, final List<Token> tok
  final String bitSetName = formatScopedName(scope, bitsetToken.applicableTypeName());
  out.append(generateFileHeader(bitSetName, null));
  out.append(generateFixedFlyweightStruct(bitSetName));
- out.append(String.format("\n" +
- "enum %1$s_meta_attribute\n" +
- "{\n" +
- " %1$s_meta_attribute_EPOCH,\n" +
- " %1$s_meta_attribute_TIME_UNIT,\n" +
- " %1$s_meta_attribute_SEMANTIC_TYPE,\n" +
- " %1$s_meta_attribute_PRESENCE\n" +
- "};\n\n" +
-
- "union %1$s_float_as_uint\n" +
- "{\n" +
- " float fp_value;\n" +
- " uint32_t uint_value;\n" +
- "};\n\n" +
-
- "union %1$s_double_as_uint\n" +
- "{\n" +
- " double fp_value;\n" +
- " uint64_t uint_value;\n" +
- "};\n",
- bitSetName));
  out.append(generateFixedFlyweightCodeFunctions(bitSetName, bitsetToken.encodedLength()));
 
  out.append(String.format("\n" +