[cmake] fix SOVERSION

CMakeLists.txt

@@ -800,12 +800,12 @@ else ()
   if (BUILD_SHARED)
     add_library (libzmq SHARED $<TARGET_OBJECTS:objects> ${public_headers} ${html-docs} ${readme-docs} ${zmq-pkgconfig} ${CMAKE_CURRENT_BINARY_DIR}/version.rc)
     target_link_libraries (libzmq ${OPTIONAL_LIBRARIES})
-    # NOTE: the SOVERSION MUST be the same as the one generated by libtool!
+    # NOTE: the SOVERSION and VERSION MUST be the same as the one generated by libtool! It is NOT the same as the version of the package.
     set_target_properties (libzmq PROPERTIES
                           COMPILE_DEFINITIONS "DLL_EXPORT"
                           PUBLIC_HEADER "${public_headers}"
-                          VERSION ${ZMQ_VERSION}
-                          SOVERSION "5.1.4"
+                          VERSION "5.1.4"
+                          SOVERSION "5"
                           OUTPUT_NAME "zmq"
                           PREFIX "lib")
     if (ZMQ_BUILD_FRAMEWORK)