replace custom Gob2 check with GOB2_CHECK() from gob2.m4

 * Allows us to check for the Gob2 version at ./configure time
 * this file ships with Gob2 installations, so in most cases
   it could be found without shipping it with SciTECO.
 * Autoconf is built such that source distributions will contain
   all additional external macros compiled in aclocal.m4.
 * However if somebody builds from Git, he/she would still
   expect the ./configure checks to produce meaningful results
   even if not all dependencies are installed properly.
   It therefore seems to be good practice to include all
   external M4 macros (gob2.m4) as a fallback with the source tree.
 * /usr/share/aclocal contains many more useful m4 macros.
   However since we can depend on pkg-config e.g. for finding
   Gtk+ and Glib, I won't use those macros as else I would
   have to bundle them to achieve the same kind of ./configure
   robustness.

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