build from tarball uses bison

[Bruno Haible]

A build of poke-0.90 uses bison:

bison -d -t --report=state --output pk-map-tab.c \
          ../../poke/pk-map-tab.y

While the GCS allow this (see
<https://www.gnu.org/prep/standards/html_node/Utilities-in-Makefiles.html>),
it is a best practice to avoid bison as a build prerequisite, by packaging
the generated files in the tarball. See
<https://www.gnu.org/prep/standards/html_node/Makefile-Basics.html>

The attached patch to poke/Makefile.am fixes this.

The libpoke/ subdirectory has a related problem: It distributes the
pkl-tab.h and pkl-tab.c files (good!), but erases them during "make clean".
After "make clean", "make" then needs bison here as well:

bison -d -t --report=state --output pkl-tab.c \
          ./pkl-tab.y

Also fixed in the patch.

0001-Make-it-possible-to-build-the-tarballs-without-bison.patch
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