Similar to r289355, /usr/tests is within the base system so put the symbols
into /usr/lib/debug.
This covers some missing files:
/usr/tests/libexec/rtld-elf/.debug /usr/tests/libexec/rtld-elf/.debug/libpythagoras.so.0.debug /usr/tests/lib/libc/tls/.debug /usr/tests/lib/libc/tls/.debug/libh_tls_dynamic.so.1.debug /usr/tests/lib/libc/tls/.debug/h_tls_dlopen.so.debug /usr/tests/lib/libthr/dlopen/.debug /usr/tests/lib/libthr/dlopen/.debug/h_pthread_dlopen.so.1.debug /usr/tests/lib/libxo/.debug /usr/tests/lib/libxo/.debug/libenc_test.so.debug
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