Fix one of upstream non-determinism, tracked here:

https://github.com/JuliaLang/julia/issues/34115
https://github.com/JuliaLang/julia/issues/25900


Patch by Nicoló Balzarotti <nicolo@nixo.xyz>.

--- a/base/loading.jl
+++ b/base/loading.jl
@@ -807,7 +807,10 @@
         path = normpath(joinpath(dirname(prev), _path))
     end
     if _track_dependencies[]
-        push!(_require_dependencies, (mod, path, mtime(path)))
+          push!(_require_dependencies,
+                (mod, path,
+                 haskey(ENV, "SOURCE_DATE_EPOCH") ?
+                 parse(Float64, ENV["SOURCE_DATE_EPOCH"]) : mtime(path)))
     end
     return path, prev
 end
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<tr><td><span title='2021-05-22 16:04:59 +0200'>2021-05-22</span></td><td><a href='/guix/commit/gnu/packages/fabric-management.scm?id=404feffa303e38a6a48443faa229864157c3bc1c'>gnu: ucx: Restore (and adapt) ioctl fallback patch.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to 4ebd4a58ce307874b18c30ffcd4852440e475ad5 which
removed the patch, but it was still necessary for some dependents.

* gnu/packages/patches/ucx-tcp-iface-ioctl.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/fabric-management.scm (ucx)[source](patches): New field.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2021-05-18 22:23:48 +0200'>2021-05-18</span></td><td><a href='/guix/commit/gnu/packages/fabric-management.scm?id=4ebd4a58ce307874b18c30ffcd4852440e475ad5'>gnu: ucx: Update to 1.9.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/patches/ucx-tcp-iface-ioctl.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/fabric-management.scm (ucx): Update to 1.9.0.
[source](patches): Remove.
</span></span></td><td>Marius Bakke</td></tr>