removed legacy cmake libsdir entry (#24813)

(cherry picked from commit 60e813df6b7dfe599266cf36ddd52ba204917267)
(cherry picked from commit aa409f8993f3ee5e90dd64511f34504ebafec7d1)

cmake/platform/unix/settings.cmake

@@ -4,12 +4,6 @@ if(NOT CONF_DIR)
   message(STATUS "UNIX: Using default configuration directory")
 endif()
 
-# set default library directory
-if( NOT LIBSDIR )
-  set(LIBSDIR ${CMAKE_INSTALL_PREFIX}/lib)
-  message(STATUS "UNIX: Using default library directory")
-endif()
-
 # configure uninstaller
 configure_file(
   "${CMAKE_SOURCE_DIR}/cmake/platform/cmake_uninstall.in.cmake"

cmake/showoptions.cmake

@@ -9,9 +9,6 @@ message("")
 # output information about installation-directories and locations
 
 message("* Install core to        : ${CMAKE_INSTALL_PREFIX}")
-if(UNIX)
-  message("* Install libraries to   : ${LIBSDIR}")
-endif()
 message("")
 
 # Show infomation about the options selected during configuration