This following patch was originally found at the debian mingw-w64 team's
mingw-w64 repo located here:
https://salsa.debian.org/mingw-w64-team/mingw-w64.git

Invoke the following in the aforementioned repo to see the original patch:

  $ git show 4974e2c:debian/patches/dlltool-temp-prefix.patch

Description: Specify dlltool's temp prefix
Author: Stephen Kitt <steve@sk2.org>

By default dlltool uses its pid for the object files it generates.
Enforcing its temp prefix allows the files it generates to be
reproducible.

--- a/mingw-w64-crt/Makefile.am
+++ b/mingw-w64-crt/Makefile.am
@@ -36,7 +36,7 @@
   DTDEF32=$(GENLIB) $(DLLTOOLFLAGS32) $(AM_DLLTOOLFLAGS)
   DTDEF64=$(GENLIB) $(DLLTOOLFLAGS64) $(AM_DLLTOOLFLAGS)
 else
-  AM_DLLTOOLFLAGS=-k --as=$(AS) --output-lib $@
+  AM_DLLTOOLFLAGS=-k --as=$(AS) --output-lib $@ --temp-prefix $$(basename $@ .a)
   DLLTOOLFLAGSARM32=-m arm
   DLLTOOLFLAGSARM64=-m arm64
   DLLTOOLFLAGS32=--as-flags=--32 -m i386
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<div class='path'>path: <a href='/guix/log/?id=59ae22458b4e83ace8f7ad5680df703fbe1c068e'>root</a>/<a href='/guix/log/gnu?id=59ae22458b4e83ace8f7ad5680df703fbe1c068e'>gnu</a>/<a href='/guix/log/gnu/services?id=59ae22458b4e83ace8f7ad5680df703fbe1c068e'>services</a>/<a href='/guix/log/gnu/services/games.scm?id=59ae22458b4e83ace8f7ad5680df703fbe1c068e'>games.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/games.scm?id=59ae22458b4e83ace8f7ad5680df703fbe1c068e&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-11-20 22:40:44 +0530'>2018-11-20</span></td><td><a href='/guix/commit/gnu/services/games.scm?id=662e2285f502b65600b0b5a12c040d050be8999d'>services: wesnothd: Run as wesnothd user and group.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/games.scm (wesnothd-shepherd-service): Run as wesnothd user and
group.
</span></span></td><td>Arun Isaac</td></tr>
<tr><td><span title='2018-05-14 20:15:28 +0530'>2018-05-14</span></td><td><a href='/guix/commit/gnu/services/games.scm?id=f93c7a89797667db073b1ddbb0fbbea41f16bf33'>gnu: services: Fix wesnothd-configuration? symbol export.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/games.scm: Export wesnothd-configuration?, not the
non-existent wesnoth-configuration?.
</span></span></td><td>Arun Isaac</td></tr>
<tr><td><span title='2018-02-09 14:55:17 +0530'>2018-02-09</span></td><td><a href='/guix/commit/gnu/services/games.scm?id=a76acfd3f5ea6cced10af5a191d057f29b87f277'>gnu: services: Add wesnothd service.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/games.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* doc/guix.texi (Game Services): Document the service.
</span></span></td><td>Arun Isaac</td></tr>