fix: remove not needed software checks

CMakeLists.txt

@@ -52,28 +52,6 @@ find_package(ZLIB REQUIRED)
 include_directories(${ZLIB_INCLUDE_DIR})
 link_libraries(${ZLIB_LIBRARIES})
 
-#find postgres
-find_package(PostgreSQL)
-if(PostgreSQL_FOUND)
-include_directories(${PostgreSQL_INCLUDE_DIR})
-link_libraries(${PostgreSQL_LIBRARIES})
-endif()
-
-#Find mysql, only mariadb client liberary is supported
-find_package(MySQL)
-if(MYSQL_FOUND)
-    message(STATUS "inc:" ${MYSQL_INCLUDE_DIR})
-    message(STATUS "libs:" ${MYSQL_CLIENT_LIBS})
-    message(STATUS "version:" ${MYSQL_VERSION_STRING})
-    if(MYSQL_VERSION_STRING STREQUAL "")
-        message(STATUS "The mysql in your system is not the mariadb, so we can't use it in drogon")
-    else()
-        message(STATUS "Ok! We find the mariadb!")
-        include_directories(${MYSQL_INCLUDE_DIR})
-        link_libraries(${MYSQL_CLIENT_LIBS})
-    endif()
-endif()
-
 #Find sqlite3.
 find_package (SQLite3)
 if (SQLITE3_FOUND)