Comment # 1 on bug 1194202 from Bernhard Wiedemann

I have done some patches with -Wl,--no-insert-timestamp in the past for efi,
ipxe and wine-related stuff, but I just remembered that we have a whole OBS
project for building w32 and w64 binaries and those could profit from toolchain
patches.

I think for .dll files, the value has some significance, so using
SOURCE_DATE_EPOCH there is better than -Wl,--no-insert-timestamp