The build was failing with:

  CCLD     lockd.la
libtool:   error: can't build i686-pc-cygwin shared library unless -no-undefined is specified

Rather than add yet another $(CYGWIN_EXTRA_LDFLAGS) to all the
impacted *_la_LDFLAGS, it was easier to just pull the extra
flags into ALL libraries via AM_LDFLAGS.

Then, fix lockd_la_LDFLAGS to include AM_LDFLAGS, like all other
libraries.
Signed-off-by: NEric Blake <eblake@redhat.com>