sagelib: fix missing pkgs.pkgconfig

Again: eb3f0aef43 #54306
Apparently the derivation needs both pkgconfigs
(it fails when missing either).

+3
+1
pkgs/applications/science/math/sage/default.nix
··· 35 inherit flint ecl arb; 36 inherit sage-src pynac singular; 37 linbox = pkgs.linbox.override { withSage = true; }; 38 }; 39 }; 40 };
··· 35 inherit flint ecl arb; 36 inherit sage-src pynac singular; 37 linbox = pkgs.linbox.override { withSage = true; }; 38 + pkg-config = pkgs.pkgconfig; # not to confuse with pythonPackages.pkgconfig 39 }; 40 }; 41 };
+2
pkgs/applications/science/math/sage/sagelib.nix
··· 30 , numpy 31 , pari 32 , pkgconfig 33 , planarity 34 , ppl 35 , pynac ··· 63 iml 64 perl 65 jupyter_core 66 ]; 67 68 buildInputs = [
··· 30 , numpy 31 , pari 32 , pkgconfig 33 + , pkg-config 34 , planarity 35 , ppl 36 , pynac ··· 64 iml 65 perl 66 jupyter_core 67 + pkg-config 68 ]; 69 70 buildInputs = [