Linux

CMake: Use imported targets for Iconv library. #637

Job	Run time
Default	4m 7s
Static	3m 48s
Maintainer-mode	3m 51s
Named SHM - SysV, Maintainer-mode	4m 10s
Named SHM - Classic mmap, Maintainer-mode	3m 50s
Pool-debug	4m 8s
Pool-debug, maintainer-mode	3m 56s
Thread-debug, maintainer-mode	3m 43s
Maintainer-mode, no IPv6	3m 50s
Maintainer-mode, -Werror	3m 52s
With crypto	3m 53s
ASan	4m 13s
ASan, pool-debug	4m 8s
UBsan	4m 3s
LMDB	3m 49s
Berkeley DB v5.3	3m 59s
	1h 3m 20s

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