glibtool: init

glibtool is simply libtool with "g" prefixed, because this is the
convention adopted in MacOS for distinguishing between GNU versions of
binaries/libraries and their equivalents shipped by Apple. Much software
for MacOS assumes that libtool can be found at `glibtool` so this is a
convenience wrapper for this case.

pkgs/by-name/gl/glibtool/package.nix

@@ -0,0 +1,7 @@
+{ libtool }:
+
+libtool.overrideAttrs {
+  pname = "glibtool";
+  meta.mainProgram = "glibtool";
+  configureFlags = [ "--program-prefix=g" ];
+}