Fix build with Poco Redis

[filimonov]

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Changelog category (leave one):

• Non-significant (changelog entry is not needed)

Was getting that (Debug build, clang-8)

[build] FAILED: dbms/src/Dictionaries/CMakeFiles/clickhouse_dictionaries.dir/RedisDictionarySource.cpp.o 
...
[build] ../../dbms/src/Dictionaries/RedisDictionarySource.cpp:38:14: fatal error: 'Poco/Redis/Array.h' file not found
[build] #    include <Poco/Redis/Array.h>
[build]              ^~~~~~~~~~~~~~~~~~~~
[build] 1 error generated.

[filimonov]

Not sure if needed. Maybe cmake cache cleanup was enough.

See also:

ClickHouse/cmake/find/poco.cmake

Lines 81 to 84 in 15cb620

	if (NOT DEFINED ENABLE_POCO_REDIS OR ENABLE_POCO_REDIS)
	set (Poco_Redis_LIBRARY PocoRedis)
	set (Poco_Redis_INCLUDE_DIR "${ClickHouse_SOURCE_DIR}/contrib/poco/Redis/include/")
	endif ()

ClickHouse/dbms/src/Dictionaries/CMakeLists.txt

Lines 39 to 45 in 6e28c22

	if(USE_POCO_REDIS)
	# for code highlighting in CLion
	# target_include_directories(clickhouse_dictionaries SYSTEM PRIVATE ${Poco_Redis_INCLUDE_DIR})
	# for build
	target_link_libraries(clickhouse_dictionaries PRIVATE ${Poco_Redis_LIBRARY})
	endif()

[abyss7]

@filimonov did the cache clean-up actually help?

[alexey-milovidov]

Yes, the cache cleanup actually helps.

[alexey-milovidov]

The changes are unnecessarily but look good for consistency.