meson: Allow building papd without CUPS, GitHub #1774 #295

Job	Run time
Build Netatalk container	46s
Build Netatalk testsuite container	57s
Netatalk container dry run	6s
AFP spec test - AFP 3.2	1m 6s
AFP spec test - AFP 2.2	57s
AFP spec test - AFP 3.0	1m 6s
AFP spec test - AFP 3.1	1m 6s
AFP spec test - AFP 3.3	1m 9s
AFP spec test - AFP 3.4	1m 6s
AFP login test - AFP 3.4	9s
AFP login test - AFP 2.1	7s
AFP spec test (Readonly) - AFP 2.1	5s
AFP spec test (Readonly) - AFP 3.4	5s
AFP spec test - AFP 2.1	57s
	9m 42s

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