haproxy: Update to version 1.5.1.

Update to version 1.5.1 and added some features:

USE_ZLIB=1
USE_OPENSSL=1
USE_PCRE=1 USE_PCRE_JIT=1
USE_KQUEUE=1

Using bindir and not sbindir.

Signed-off-by: Rudá Moura <ruda.moura@gmail.com>