(Fixes for libdir path flagged in sr#838414)
- Specify gRPC_INSTALL_LIBDIR and gRPC_INSTALL_CMAKEDIR to correctly configure install paths for libraries and cmake files instead of moving them after the installation.
- Add grpc-correct-pkgconfig-path.patch to fix install path for pkgconfig file relative to gRPC_INSTALL_LIBDIR.
- Add Requires: pkgconfig(libcares) for the -devel pkg.
OBS-URL: https://build.opensuse.org/request/show/841058
OBS-URL: https://build.opensuse.org/package/show/devel:tools/grpc?expand=0&rev=68
