Update liboqs to version 0.7.1 / rev 4 via SR 986343
https://build.opensuse.org/request/show/986343
by user msmeissn + dimstar_suse
- Add upstream changes:
* 0001-Add-support-for-powerpc64.-1160.patch
* 0002-Mark-stack-non-executable-when-compiling-with-clang-.patch
- Spec cleanup