As noted in #21700, our pynac spkg-install script explicitly disables use of giac. So that should not be a dependency.

Removing the dependency allows for greater parallelization of the build.

This is also a step toward allowing to build Sage with ./configure --without-giac (see #30383 - configure --disable-SPKG for standard packages).

See also:

• spkg-configure.m4 for pynac #29542 spkg-configure.m4 for pynac

CC: @dimpase @jhpalmieri @thierry-FreeBSD @orlitzky @tobiasdiez

Component: packages: standard

Keywords: dependencies, giac, pynac

Author: Matthias Koeppe

Branch/Commit: 9c5f559

Reviewer: John Palmieri

Issue created by migration from https://trac.sagemath.org/ticket/30718