MDEV-22078 MariaDB-compat missing from MariaDB 10.4 CentOS 8 Yum Repo

Backport INSALL_SYMLINK cmake macro from 10.3.
It'll make libmysqlclient_r.* symlinks to link to the actual
shared library file, not to another symlink.

As a bonus it'll fix cmake warning about deprecated LOCATION property

cmake/install_macros.cmake

@@ -162,17 +162,13 @@ ENDFUNCTION()
 # and extension will be the same as for target file.
 MACRO(INSTALL_SYMLINK linkname target destination component)
 IF(UNIX)
-  GET_TARGET_PROPERTY(location ${target} LOCATION)
-  GET_FILENAME_COMPONENT(path ${location} PATH)
-  GET_FILENAME_COMPONENT(name ${location} NAME)
-  SET(output ${path}/${linkname})
+  SET(output ${CMAKE_CURRENT_BINARY_DIR}/${linkname})
   ADD_CUSTOM_COMMAND(
     OUTPUT ${output}
-    COMMAND ${CMAKE_COMMAND} ARGS -E remove -f ${output}
+    COMMAND ${CMAKE_COMMAND} ARGS -E remove -f ${linkname}
     COMMAND ${CMAKE_COMMAND} ARGS -E create_symlink 
-      ${name} 
+      $<TARGET_FILE_NAME:${target}>
       ${linkname}
-    WORKING_DIRECTORY ${path}
     DEPENDS ${target}
     )