What difference does it make if it's a home PC? I still lock the doors and windows to my home.
You should build glibc by passing --with-arch=i486 to the configure script not adding -march=i586 to the CFLAGS. To execute just a specific test, for example this new failed test, you would
cd /home/king/glibc/build/dlfcn && make check
That will only run the tests found in the Makefile in /home/king/glibc/build/dlfcn.
As far as the bug-atexit3 test, I would ignore it (was it the only error you got?) and continue.