EX-5045 lipe: use LDADD

EX-5045 lipe: use LDADD

Use foo_LDADD rather than foo_LDFLAGS to avoid future errors with
strict linkers. Remove AC_SEARCH_LIBS() uses for ext2fs and com_err,
since we already use PKG_CHECK_MODULES() to check for ext2fs
libraries, and not all lipe utilities need -lext2fs.

Signed-off-by: John L. Hammond <jhammond@whamcloud.com>
Change-Id: I1de960fcec5a8770984d9b1437423a854948eb84
Reviewed-on: https://review.whamcloud.com/47443
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Feng, Lei <flei@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>