Delete dummy libc.so that was created during glibc-initial step.

Delete dummy libc.so that was created during glibc-initial step.
This library is overwritten by a linker script file called libc.so during
complete glibc install so the packaged built after glibc is staged are fine.
But the binaries/libraries that build with glibc and depend on libc.so  in some
form see this dummy libc.so and gets things wrong.
This fix deletes the dummy libc.so before gcc-intermediate is staged. Because
the main purpose of dummy libc.so is to get gcc-intermediate built with shared
lib support. Ideally this libc.so should be deleted right after do_configure of
gcc-intermediate but gcc's configure is spread across and some configure stuff
happens during compile step. Therefore its best to delete this libc.so after
the compile step is done.