snapcast: add snapserver and snapclient packages #21513

Job	Run time
Feeds Package Test Build / Test aarch64_generic	5m 21s
Feeds Package Test Build / Test arm_cortex-a15_neon-vfpv4	3m 55s
Feeds Package Test Build / Test arm_cortex-a9_vfpv3-d16	3m 6s
Feeds Package Test Build / Test i386_pentium-mmx	2m 37s
Feeds Package Test Build / Test mips_24kc	3m 15s
Feeds Package Test Build / Test mipsel_24kc	3m 14s
Feeds Package Test Build / Test powerpc_464fp	4m 6s
Feeds Package Test Build / Test powerpc_8548	3m 11s
Feeds Package Test Build / Test riscv64_riscv64	3m 25s
Feeds Package Test Build / Test x86_64	3m 15s
	35m 25s

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