dracut-install: install libs also from one dir above

dracut-install: install libs also from one dir above

some HW has different flavors of basic libs

$ ldconfig -p|fgrep libc.so
libc.so.6 (libc6,64bit, hwcap: 0x0000001000000000, OS ABI: Linux 2.6.32) => /lib64/power6/libc.so.6
libc.so.6 (libc6,64bit, hwcap: 0x0000000000000200, OS ABI: Linux 2.6.32) => /lib64/power6x/libc.so.6
libc.so.6 (libc6,64bit, OS ABI: Linux 2.6.32) => /lib64/libc.so.6

because setting LD_HWCAP_MASK=0 does not work, we have to workaround
this.

$ LD_TRACE_LOADED_OBJECTS=1  LD_HWCAP_MASK=0 /lib64/ld64.so.1 /bin/sh | fgrep libc.so
libc.so.6 => /lib64/power6/libc.so.6 (0x000000804e260000)

Now we try to install the same library from one directory above the one
we installed also.