haproxy: bump to version 1.5.8

Released version 1.5.8 with the following main changes :
 - BUG/MAJOR: buffer: check the space left is enough or not
   when input data in a buffer is wrapped
 - BUG/BUILD: revert accidental change in the
   makefile from latest SSL fix

Signed-off-by: Thomas Heil <heil@terminal-consulting.de>