Better rpath fix

[yosifkit]

This reverts #785 and then only changes rpath for python3.x binaries and not the libraries in /usr/local/lib/python3.x/lib-dynload/ since they use system libraries like libssl (so $ORIGIN/../lib doesn't work for them).

Hopefully this should also fix issues like #786 or #787

Broken, current version:

$ docker run -it --rm python:3.9 bash
root@8f5b65b7cd6b:/# readelf --dynamic /usr/local/lib/python3.9/lib-dynload/_ssl.cpython-39-x86_64-linux-gnu.so

Dynamic section at offset 0x24d58 contains 28 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libssl.so.1.1]
 0x0000000000000001 (NEEDED)             Shared library: [libcrypto.so.1.1]
 0x0000000000000001 (NEEDED)             Shared library: [libpthread.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x000000000000001d (RUNPATH)            Library runpath: [/../lib:$ORIGIN/../lib]
...
root@8f5b65b7cd6b:/# # but ldd somehow still works 🤷
root@8f5b65b7cd6b:/# ldd /usr/local/lib/python3.9/lib-dynload/_ssl.cpython-39-x86_64-linux-gnu.so
	linux-vdso.so.1 (0x00007fff459dd000)
	libssl.so.1.1 => /usr/lib/x86_64-linux-gnu/libssl.so.1.1 (0x00007fabee010000)
	libcrypto.so.1.1 => /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1 (0x00007fabedd1c000)
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fabedcfa000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fabedb25000)
	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fabedb1f000)
	/lib64/ld-linux-x86-64.so.2 (0x00007fabee0da000)

[tianon]

+ readlink -ve /usr/local/bin/python3
readlink: unrecognized option: e
BusyBox v1.35.0 (2022-11-19 10:13:10 UTC) multi-call binary.

Usage: readlink [-fnv] FILE

Display the value of a symlink

	-f	Canonicalize by following all symlinks
	-n	Don't add newline
	-v	Verbose
+ bin=

Classic BusyBox 😄