libs: Add linking dependency for libmodechk

When building Cobalt core ALT rpmbuild QA script detects that libmodechk
is linked improperly:

verify-elf: ERROR: ./usr/lib64/libmodechk.so.0.0.0: undefined symbol: cobalt_assert_nrt

Signed-off-by: Vitaly Chikunov <vt@altlinux.org>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
11 jobs for master in 29 minutes and 21 seconds (queued for 11 seconds)
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