Feed AC_CONFIG_SRCDIR with a truly libGAP input

Description: autotoolization: autoconf: unambiguous AC_CONFIG_SRCDIR input Provide AC_CONFIG_SRCDIR with a source that is truly unique to the libGAP source ball. For some distributions, the source ball must be organized in such a way that copyright of each material is unambiguous. In other words, ambiguous material might be discarded from src/: at the time of packaging, AC_CONFIG_SRCDIR is fed with a patched source file from the GAP-core source ball, to avoid any trouble we want to feed it with a truly libGAP source file. Meant to be submitted to the upstream maintainer. Origin: vendor, Debian Author: Jerome Benoit calculus@rezozer.net Last-Update: 2016-11-12