In general case, user library path is specifed as /usr/lib/, however,
if the user library path is specified as /lib/ which is a symbolic link to /usr/lib/,
current eina_prefix_new logic will print warning messages.
(actually the logic finds a /usr/lib/ path once a fallback logic runs)
This patch modifies the logic to find a proper path of lib path even if it is specified as symlink.