bison: update to 3.2.1

bison: update to 3.2.1

Chnages since 3.2:

b590ad02 version 3.2.1
05e70adf build: fix issues in the generated tarball
7efe0b5d build: fix typo
351e3630 NEWS: update
4fd1fc70 examples: ship them
e02ce4c7 build: minor fixes in doc/
7cab285e CI: maximize chances of errors sooner
86efe282 c++: improve the generated documentation
cf1446dc tests: don't fail if the C++ compiler does not work
e93c40b3 tests: don't disable C++ warnings in C files
eff67391 c++: workaround portability issue
5a0d7802 tests: work around getopt portability issues
f1e0839c doc: -Wzero-as-null-pointer-constant was added to GCC 4.7
3bf429ae examples: #include <cstring> in calc++
f8cadc73 c: provide a definition of _Noreturn that works for C++
bd7aebb8 c: update the definition of _Noreturn
ca8039e6 tests: don't expect the shell to support 'local'
5d07f4f7 bitset: fix warning
e605ad96 build: fix use of gnulib Make variables
50fac71d maint: post-release administrivia

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
(backported from 80526d2fed2351e7e2dbd8b7e0c296856624481f)