libslirp: Update to version 4.9.1

libslirp: Update to version 4.9.1

- Update from version 4.7.0 to 4.9.1
- Update of rootfile not required
- 2 security fixes in version 4.8.0
- Changelog
    4.9.1
	Fixed
	  - meson: use boolean defaults for boolean options !149
	  - meson: specify that C++ is only used for host binaries !149
	  - meson: add dependency override for libslirp !150
	  - Do not link tests with libslirp.map #84
	  - apple: Fix getting IPv4 DNS server address when IPv4 and IPv4 are
	    interleaved #85
	  - Windows: Fix ICMP generation #87 #88
	  - tcp: Fix starting the linger2 timer on socket shutdown #86
	Changed
	  - tcp: on input, reset TCPT_KEEP to TCPTV_KEEP_IDLE rather than
	    TCPTV_KEEPINTVL
	  - tcp: on input during init, reset TCPT_KEEP to TCPTV_KEEP_INIT
	  - tcp: Reduce linger time to two minutes
    4.9.0
	Added
	  - Add SlirpAddPollSocketCb and {,un}register_poll_socket that can be used from
	    SLIRP_CONFIG_VERSION_MAX 6 to properly support socket handles on win64.
	Fixed
	  - bootp: Fill siaddr with tftp addr as per RFC2131 !135
	  - tcp_listen: Fix host forwarding on Windows !137
	  - tftp: Fix address returned in proxying #82 !147
	Changed
	  - Fix build on mold #77
	  - Fix static linking !134
	  - slirp_os_socket abstraction for Windows !136
	  - cksum: Update implementation to include 64-bit computation support !144
	  - reduce compilation warnings on Windows !143
    4.8.0
	Security
	  - tcp: Fix testing for last fragment
	  - tftp: Fix use-after-free
	Added
	  - Add support for Haiku !123
	  - ncsi: Add manufacturer's ID !122
	  - ncsi: Add Get Version ID command !122
	  - ncsi: Add out-of-band ethernet address !125
	  - ncsi: Add Mellanox Get Mac Address handler !125
	  - icmp6: Add echo request forwarding support
	  - Add fuzzing infrastructure
	Fixed
	  - Fix missing cleanups
	  - windows: Build fixes
	  - ipv6: Use target address from Neighbor Advertisement !129
	  - dns: Reject domain-search when any entry ends with ".."
	  - dns: Use localhost as dns when /etc/resolv.conf empty !130
	  - icmp: Handle ICMP packets as IPPROTO_IP on BSD !133
	  - eth: pad ethernet frames to 60 bytes #34

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>