Do not export symbols from private "/common/utils"

Libraries and applications (libdnf5.so, dnf5, dnf5daemon-client...) use
(and statically link) private utilities from "/common/utils".
And they also publicly export the symbols of these private utilities.

This modification hides the symbols of utilities linked from
"/common/utils".

common/CMakeLists.txt

@@ -4,6 +4,7 @@ include_directories(.)
 
 add_library(common OBJECT ${COMMON_SOURCES})
 set_property(TARGET common PROPERTY POSITION_INDEPENDENT_CODE ON)
+set_target_properties(common PROPERTIES C_VISIBILITY_PRESET hidden CXX_VISIBILITY_PRESET hidden)
 
 # required by clang
 target_link_libraries(common PUBLIC stdc++)

libdnf5-cli/CMakeLists.txt

@@ -33,6 +33,8 @@ install(TARGETS libdnf5-cli LIBRARY DESTINATION ${CMAKE_INSTALL_FULL_LIBDIR})
 
 # link libraries and set pkg-config requires
 
+target_link_libraries(libdnf5-cli PRIVATE common)
+
 target_link_libraries(libdnf5-cli PUBLIC libdnf5)
 
 pkg_check_modules(LIBFMT REQUIRED fmt)