lxc: add missing deps #21532

Job	Run time
Feeds Package Test Build / Test aarch64_generic	12m 39s
Feeds Package Test Build / Test arm_cortex-a15_neon-vfpv4	11m 27s
Feeds Package Test Build / Test arm_cortex-a9_vfpv3-d16	13m 15s
Feeds Package Test Build / Test i386_pentium-mmx	12m 51s
Feeds Package Test Build / Test mips_24kc	12m 11s
Feeds Package Test Build / Test mipsel_24kc	13m 5s
Feeds Package Test Build / Test powerpc_464fp	13m 5s
Feeds Package Test Build / Test powerpc_8548	12m 22s
Feeds Package Test Build / Test riscv64_riscv64	13m 6s
Feeds Package Test Build / Test x86_64	14m 12s
	2h 8m 13s

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