- Update to version 1.3.5
* Fix spelling/wording issues
* gitlab CI: add a basic build test
* Xge.c, Xge.h: convert from ISO-8859-1 to UTF-8
* Add extutilP.h header for xgeExtRegister() prototype
* Remove unnecessary casts of malloc/calloc results
* Remove unnecessary (char *) casts from Xfree() arguments
* Use calloc instead of malloc if we may not initialize all the bytes
* Import reallocarray() from libX11
* Convert calls to Xmalloc arrays to use Xmallocarray instead
* configure: Use AC_USE_SYSTEM_EXTENSIONS to set GNU_SOURCE & other defines
* Remove "All rights reserved" from Oracle copyright notices.
* COPYING: Add info for Xge.* and reallocarray.* files
* add ACLOCAL_AMFLAGS = -I m4 to make aclocal pick ax_gcc_builtin.m4