[C++] Stop clang-tidy from falsely analyzing sbeCheckPosition should be static.

Author: denizevrenci

sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/cpp/CppGenerator.java

@@ -296,6 +296,7 @@ private static void generateGroupClassHeader(
  indent + " return *m_positionPtr;\n" +
  indent + " }\n\n" +
 
+ indent + " // NOLINTNEXTLINE(readability-convert-member-functions-to-static)\n" +
  indent + " std::uint64_t sbeCheckPosition(const std::uint64_t position)\n" +
  indent + " {\n" +
  indent + " if (SBE_BOUNDS_CHECK_EXPECT((position > m_bufferLength), false))\n" +
@@ -1988,6 +1989,7 @@ private CharSequence generateMessageFlyweightCode(final String className, final
  " return m_position;\n" +
  " }\n\n" +
 
+ " // NOLINTNEXTLINE(readability-convert-member-functions-to-static)\n" +
  " std::uint64_t sbeCheckPosition(const std::uint64_t position)\n" +
  " {\n" +
  " if (SBE_BOUNDS_CHECK_EXPECT((position > m_bufferLength), false))\n" +