Windows nightly build failure

The Windows nightly builds currently fail while building firefox with:

31:36.72 /var/tmp/dist/mingw-w64-clang/bin/x86_64-w64-mingw32-clang++ -mwindows -shared -Wl,--out-implib -Wl,libclearkey.a -Wl,-pdb,clearkey.pdb -o clearkey.dll @/var/tmp/build/firefox-e489c5048b76/obj-mingw/media/gmp-clearkey/0.1/clearkey_dll.list ./module.res  -Wl,--no-insert-timestamp -Wl,--dynamicbase -Wl,--icf=safe        -luuid -lusp10 -lgdi32 -lwinmm -lwsock32 -luserenv -lsecur32 -lmfuuid
31:36.77 lld-link: error: undefined symbol: __strcat_chk
31:36.77 >>> referenced by /var/tmp/build/firefox-e489c5048b76/media/gmp-clearkey/0.1/openaes/oaes_lib.c:459
31:36.77 >>>               oaes_lib.o:(oaes_sprintf)
31:36.77 clang-8: error: linker command failed with exit code 1 (use -v to see invocation)
31:36.77 /var/tmp/build/firefox-e489c5048b76/config/rules.mk:680: recipe for target 'clearkey.dll' failed
31:36.77 make[4]: *** [clearkey.dll] Error 1