LFS64 removal on musl-1.2.4

[immolo]

Musl has removed LFS64 in 1.2.4 as mentioned in https://github.com/leethomason/tinyxml2/pull/868

Can we use ftello and fseeko for Linux now to keep this program working please.

tinyxml2.txt

Further infomation at https://bugs.gentoo.org/905999