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
@@ -1131,7 +1131,10 @@ function _include_dependency(mod::Module, _path::AbstractString)
     end
     if _track_dependencies[]
         @lock require_lock begin
-        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
     end
     return path, prev
 end
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<tr><td><span title='2024-05-22 11:15:30 +0800'>2024-05-22</span></td><td><a href='/guix/commit/gnu/system/images/visionfive2.scm?id=327a1f0779a5df8ebb57e39d4a44e040a5d0bdfe'>system: images: Add visionfive2 module.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/images/visionfive2.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

Change-Id: I8831f1148bcddb0d604e1174034fca85cd2887a1
</span></span></td><td>Zheng Junjie</td></tr>