vcpkg: Add dbd-postgresql feature. #644

Job	Run time
Default	47s
Static	57s
Maintainer-mode	5m 52s
Named SHM - SysV, Maintainer-mode	49s
Named SHM - Classic mmap, Maintainer-mode	52s
Pool-debug	48s
Pool-debug, maintainer-mode	48s
Thread-debug, maintainer-mode	52s
Maintainer-mode, no IPv6	1m 8s
Maintainer-mode, -Werror	50s
With crypto	1m 9s
ASan	1m 1s
ASan, pool-debug	1m 3s
UBsan	1m 2s
LMDB	53s
Berkeley DB v5.3	1m 2s
	19m 53s

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