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='2022-07-17 02:00:15 +0200'>2022-07-17</span></td><td><a href='/guix/commit/gnu/packages/aidc.scm?id=7b6d522a812e474f4495d237bfda4840f6e0b2c8'>gnu: libdmtx: Omit static library.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
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