[lua-socket] luasocket was not compiled with UNIX sockets support

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luasocket was not compiled with UNIX sockets support wich breaks prosody-modules so you can't use dovecot auth.

Further details are here: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=852250

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: lua-socket 3.0~rc1+git+ac3201d-4
ProcVersionSignature: Ubuntu 4.15.0-45.48-generic 4.15.18
Uname: Linux 4.15.0-45-generic x86_64
NonfreeKernelModules: binfmt_misc zfs zunicode zavl icp zcommon znvpair spl ebtable_filter ebtables cpuid veth xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp iptable_filter intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel wmi_bmof intel_wmi_thunderbolt pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd intel_cstate intel_rapl_perf shpchp intel_pch_thermal wmi bridge video stp llc mac_hid acpi_pad sch_fq_codel ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c multipath linear raid0 raid1 e1000e ahci nvme ptp pps_core libahci nvme_core
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
Date: Wed Oct 23 22:32:37 2019
Dependencies:
 gcc-8-base 8.3.0-6ubuntu1~18.04.1
 libc6 2.27-3ubuntu1
 libgcc1 1:8.3.0-6ubuntu1~18.04.1
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=C.UTF-8
SourcePackage: luasocket
UpgradeStatus: No upgrade log present (probably fresh install)