m4: bump to version 1.4.17

Remove MB_CUR_MAX patch since it's unnecessary/insufficent for non-wchar
compilation since c29e01e6

no-gets patch unnecessary also since it's been fixed.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>