installer/portable: exclude `sshd` #390

Job	Run time
determine-packages	7s
check-for-missing-dlls (32)	4m 10s
build-packages	0s
check-for-missing-dlls (64)	5m 40s
build-artifacts (portable)	3m 40s
sdk-artifacts (minimal, 64)	1s
sdk-artifacts (makepkg-git, 64)	1s
sdk-artifacts (build-installers, 32)	1m 56s
sdk-artifacts (build-installers, 64)	1m 15s
sdk-artifacts (full, 32)	1m 6s
sdk-artifacts (full, 64)	1s
	17m 57s

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