[Minor] Redis support is now unconditional

.circleci/config.yml

       - run: sudo apt-get install -qq cmake libevent-dev libglib2.0-dev libicu-dev libluajit-5.1-dev libmagic-dev libsqlite3-dev libssl-dev ragel
 
       - run: mkdir ../build ; mkdir ../install ; cd ../build
-      - run: cmake ../project -DDBDIR=/nana -DENABLE_COVERAGE=ON -DCMAKE_INSTALL_PREFIX=../install -DENABLE_HIREDIS=ON
+      - run: cmake ../project -DDBDIR=/nana -DENABLE_COVERAGE=ON -DCMAKE_INSTALL_PREFIX=../install
 
       - run: make install -j`nproc`
 

CMakeLists.txt

 IF (ENABLE_SNOWBALL MATCHES "ON")
 	LIST(APPEND RSPAMD_REQUIRED_LIBRARIES stemmer)
 ENDIF()
-IF(ENABLE_HIREDIS MATCHES "ON")
-	LIST(APPEND RSPAMD_REQUIRED_LIBRARIES rspamd-hiredis)
-ENDIF()
+LIST(APPEND RSPAMD_REQUIRED_LIBRARIES rspamd-hiredis)
 IF(ENABLE_HYPERSCAN MATCHES "OFF")
 	LIST(APPEND RSPAMD_REQUIRED_LIBRARIES rspamd-actrie)
 ENDIF()

debian/rules

 		-DENABLE_FULL_DEBUG=OFF \
 		-DENABLE_GD=OFF \
 		-DENABLE_PCRE2=OFF \
-		-DENABLE_HIREDIS=ON \
 		-DENABLE_LUAJIT=ON \
 		-DENABLE_TORCH=ON \
 		-DENABLE_LIBUNWIND=ON \

src/CMakeLists.txt

 IF (ENABLE_SNOWBALL MATCHES "ON")
 	TARGET_LINK_LIBRARIES(rspamd stemmer)
 ENDIF()
-IF(ENABLE_HIREDIS MATCHES "ON")
-	TARGET_LINK_LIBRARIES(rspamd rspamd-hiredis)
-ENDIF()
+TARGET_LINK_LIBRARIES(rspamd rspamd-hiredis)
 
 IF (ENABLE_FANN MATCHES "ON")
 	TARGET_LINK_LIBRARIES(rspamd fann)

src/libserver/CMakeLists.txt

 				${CMAKE_CURRENT_SOURCE_DIR}/url.c
 				${CMAKE_CURRENT_SOURCE_DIR}/worker_util.c)
 
-IF (ENABLE_HIREDIS MATCHES "ON")
-	LIST(APPEND LIBRSPAMDSERVERSRC "${CMAKE_CURRENT_SOURCE_DIR}/fuzzy_backend_redis.c")
-	LIST(APPEND LIBRSPAMDSERVERSRC "${CMAKE_CURRENT_SOURCE_DIR}/redis_pool.c")
-ENDIF ()
+LIST(APPEND LIBRSPAMDSERVERSRC "${CMAKE_CURRENT_SOURCE_DIR}/fuzzy_backend_redis.c")
+LIST(APPEND LIBRSPAMDSERVERSRC "${CMAKE_CURRENT_SOURCE_DIR}/redis_pool.c")
 
 # Librspamd-server
 SET(RSPAMD_SERVER ${LIBRSPAMDSERVERSRC} PARENT_SCOPE)

src/libstat/CMakeLists.txt

 					${CMAKE_CURRENT_SOURCE_DIR}/backends/sqlite3_backend.c)
 SET(CACHESSRC 	${CMAKE_CURRENT_SOURCE_DIR}/learn_cache/sqlite3_cache.c)
 
-IF(ENABLE_HIREDIS MATCHES "ON")
-	SET(BACKENDSSRC 	${BACKENDSSRC}
-					${CMAKE_CURRENT_SOURCE_DIR}/backends/redis_backend.c)
-	SET(CACHESSRC 	${CACHESSRC}
-					${CMAKE_CURRENT_SOURCE_DIR}/learn_cache/redis_cache.c)
-ENDIF(ENABLE_HIREDIS MATCHES "ON")
+SET(BACKENDSSRC 	${BACKENDSSRC}
+		${CMAKE_CURRENT_SOURCE_DIR}/backends/redis_backend.c)
+SET(CACHESSRC 	${CACHESSRC}
+		${CMAKE_CURRENT_SOURCE_DIR}/learn_cache/redis_cache.c)
 
 
 SET(RSPAMD_STAT ${LIBSTATSRC}

test/CMakeLists.txt

 IF (ENABLE_SNOWBALL MATCHES "ON")
 	TARGET_LINK_LIBRARIES(rspamd-test stemmer)
 ENDIF()
-IF(ENABLE_HIREDIS MATCHES "ON")
-	TARGET_LINK_LIBRARIES(rspamd-test rspamd-hiredis)
-ENDIF()
+TARGET_LINK_LIBRARIES(rspamd-test rspamd-hiredis)
 IF (ENABLE_HYPERSCAN MATCHES "ON")
 	TARGET_LINK_LIBRARIES(rspamd-test hs)
 ENDIF()

utils/CMakeLists.txt

 	IF (ENABLE_SNOWBALL MATCHES "ON")
 	TARGET_LINK_LIBRARIES("${NAME}" stemmer)
 	ENDIF()
-	IF(ENABLE_HIREDIS MATCHES "ON")
-		TARGET_LINK_LIBRARIES("${NAME}" rspamd-hiredis)
-	ENDIF()
+	TARGET_LINK_LIBRARIES("${NAME}" rspamd-hiredis)
 	TARGET_LINK_LIBRARIES(${NAME} rspamd-linenoise)
 	TARGET_LINK_LIBRARIES("${NAME}" ${RSPAMD_REQUIRED_LIBRARIES})
 ENDMACRO()