fix aeron-io#129 by removing addition of acting version check to array length

Author: Todd L. Montgomery

main/java/uk/co/real_logic/sbe/generation/cpp98/Cpp98Generator.java

@@ -925,11 +925,9 @@ private CharSequence generateArrayProperty(final String containingClassName,
  "\n" +
  indent + " static int %1$sLength(void)\n" +
  indent + " {\n" +
- "%2$s" +
- indent + " return %3$d;\n" +
+ indent + " return %2$d;\n" +
  indent + " }\n\n",
  propertyName,
- generateArrayFieldNotPresentCondition(token.version(), indent),
  Integer.valueOf(token.arrayLength())
  ));