Description:
bctoolbox actually depends on bcunit, not just makedepends.

Additional info:
* package version(s)
* config and/or log files etc.
* link to upstream bug report, if any

Steps to reproduce:
ldd -r /usr/lib/libbctoolbox-tester.so
linux-vdso.so.1 (0x00007fff0adf9000)
libbctoolbox.so.1 => /usr/lib/libbctoolbox.so.1 (0x00007fda90769000)
libbcunit.so.1.0.1 => not found
libc.so.6 => /usr/lib/libc.so.6 (0x00007fda90574000)
libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007fda90552000)
libdl.so.2 => /usr/lib/libdl.so.2 (0x00007fda9054d000)
libmbedtls.so.12 => /usr/lib/libmbedtls.so.12 (0x00007fda9051e000)
libmbedx509.so.0 => /usr/lib/libmbedx509.so.0 (0x00007fda904fb000)
libmbedcrypto.so.3 => /usr/lib/libmbedcrypto.so.3 (0x00007fda90499000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007fda902af000)
libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007fda90295000)
/usr/lib64/ld-linux-x86-64.so.2 (0x00007fda907ba000)
libm.so.6 => /usr/lib/libm.so.6 (0x00007fda9014f000)
undefined symbol: CU_set_output_filename (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_initialize_registry (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_run_test (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_set_trace_handler (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_set_test_complete_handler (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_get_number_of_failure_records (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_get_number_of_tests_failed (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_run_suite (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_cleanup_registry (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_automated_enable_junit_xml (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_basic_show_failures (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_set_suite_cleanup_failure_handler (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_get_error (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_automated_run_tests (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_set_test_start_handler (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_add_suite_with_setup_and_teardown (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_set_suite_init_failure_handler (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_assertImplementation (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_run_all_tests (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_get_suite (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_add_test (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_get_run_results_string (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_automated_enable_partial_junit (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_get_test_by_name (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_get_failure_list (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_set_suite_start_handler (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_set_all_test_complete_handler (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_registry_initialized (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_get_number_of_failures (/usr/lib/libbctoolbox-tester.so)
undefined symbol: CU_set_suite_complete_handler (/usr/lib/libbctoolbox-tester.so)