abiword 2.8.1: multiple fixes

abiword 2.8.1: multiple fixes

*Fixed compilation removing DOLT (from http://dolt.freedesktop.org/)
  fom configure.in, else it would file like this(output stripped) :
.../doltlibtool: exec: .../libtool: cannot execute: No such file or directory
  note that it looks for libtool and not ${TARGET_ARCH}-angstrom-linux-libtool
  in my case,more informations are disponible reading the m4 dolt file here:
  http://cgit.freedesktop.org/dolt/tree/dolt.m4
*fixed libwmf problem:
   libwmf-config is a program that is used for knowing the compilations
   flags like that :
   libwmf-config --cflags
     -I/usr/include/freetype2 -I/usr/include
   ->But like the in example the host version was called and so some
     /usr/include were included into the build process,
     --with-libwmf-config=${STAGING_DIR} fixes it
   ->also depend on the native libwmf so it is not required on the host
     in order to build abiword
*fixed runtime problem with the plugins:
  In the trunk(which regenerate configure files like we do),
  autogen-common.sh was called by autogen.sh
  And not calling it creates issues like for instance the absence of the
  the collab plugin in the installation directory