Allow `--version-script` for executables with dynsym

[MasterAwesome]

When executable has -rdynamic this adds --export-dynamic to linker argument with no way to control the exported dynamic symbols. Version script can be used here to control symbols.

Tests:

• Linker appends -version-script for binaries when -rdynamic is present.
• Linker doesn't append -version-script for binaries when -rdynamic isn't present.
• $ stage4/bin/zig build test -Denable-llvm -Dskip-release -Dskip-non-native

$ nm -D ./main # See linked issue for code
0000000001000a18 R FOO

$ llvm-readelf -Ss ./main
<snipped>
  [ 6] .custom           PROGBITS        0000000001000a18 000a18 000004 00   A  0   0  1
<snipped>

Closes: #19870