v5.3.2alpha
Update m4/.gitignore.
Fix bugs and otherwise improve ax_check_capsicum.m4.
Build: Update m4/ax_pthread.m4 from Autoconf Archive (again).
Fix the Autoconf test for getopt_long replacement. It was broken by e114502.
Major update to the xzgrep and other scripts based on the latest versions found from gzip CVS repository.
Various changes.
tuklib: Omit an unneeded <sys/types.h> from a tests.
tuklib_integer.m4: Optimize the check order.
xz: Multiple fixes.
Build: Add visibility.m4 from gnulib.