- add patches (parts of git commits from gnulib):
- gnulib-4af4a4a71827c0bc5e0ec67af23edef4f15cee8e-excerpt.patch
- gnulib-74d9d6a293d7462dea8f83e7fc5ac792e956a0ad-excerpt.patch
to fix compilation on current glibc
(fflush: adjust to glibc 2.28 libio.h removal)
(fflush: be more paranoid about libio.h change)