devel/libvirt: update to 11.10.0

• Update to 11.10.0
• As this release adds SLIRP networking support for the bhyve driver, add the SLIRP option which register dependency on net/libslirp. It's enabled by default when the BHYVE option is enabled by default, and implies BHYVE.
• Handle SHEBANG and plist entries for qemu's 'virt-qemu-qmp-proxy' and 'virt-qemu-sev-validate' scripts [1]

PR: 291283 [1] (based on)
Submitted by: David Horn [1]
Sponsored by: The FreeBSD Foundation
(cherry picked from commit 16adc595b008cad7ed789d165a3308110b953aba)