guix: disable timezone tools & profiling in glibc

Removes `var/profiles/x86_64-linux-gnu/sbin/zdump`.

Profiling is disabled by default, but make that explicit.

contrib/guix/manifest.scm

@@ -474,6 +474,8 @@ inspecting signatures in Mach-O binaries.")
                   "--enable-cet",
                   "--enable-bind-now",
                   "--disable-werror",
+                  "--disable-timezone-tools",
+                  "--disable-profile",
                   building-on)))
     ((#:phases phases)
         `(modify-phases ,phases