Reduce snap size

[simondeziel]

This was tested in a local VM:

$ lxc shell v1
root@v1:~# snap install --dangerous /dev/shm/lxd_0+git.51efcdf_amd64.snap 
Ensure prerequisites for "lxd" are available                                                                                             /Ensure prerequisites for "lxd" are available                                                                                             -Ensure prerequisites for "lxd" are available                                                                                             -Download snap "core22" (864) from channel "stable"                                                                                       -lxd 0+git.51efcdf installed
root@v1:~# snap alias lxd.lxc lxc
Added:
  - lxd.lxc as lxc

root@v1:~# file /snap/lxd/current/zfs-2.2/bin/*
/snap/lxd/current/zfs-2.2/bin/zfs:     ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=b9382230c390017d2dc339b819632aa5d7787132, for GNU/Linux 3.2.0, stripped
/snap/lxd/current/zfs-2.2/bin/zpool:   ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=3ed172a0f4a0546b3204a005d36f45615afc2335, for GNU/Linux 3.2.0, stripped
/snap/lxd/current/zfs-2.2/bin/zvol_id: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=7340404dca1357741cf5960415ab4268aebe7162, for GNU/Linux 3.2.0, stripped

Those binaries were previously not stripped.