Addresses a comment in #17779 pointing out the inability to fetch the
upstream BoringSSL sources over Git. The reason for this is because the
Git server used in this case did not include the optional (but
recommended) LF terminator for textual pkt-line data. This commit
adjusts handling of textual pkt-line data so that it works both with and
without the optional trailing LF.
Use inline to vastly simplify the exposed API. This allows a
comptime-known endian parameter to be propogated, making extra functions
for a specific endianness completely unnecessary.
