Update brp-check-suse to version 84.87+git20210517.7005a76 / rev 70 via SR 893668
https://build.opensuse.org/request/show/893668
by user oertel + dimstar_suse
- Update to version 84.87+git20210517.7005a76:
* support cross arch builds
* Makefile only set CXXFLAGS and CXX if not set in env yet
* brp-25-symlink: Follow deeper symlinks to avoid false positives