[compiler-rt] Link shared sanitizer runtime with libresolv for dn_expand (PR #116415)

[Aaron Puchert via llvm-commits]

aaronpuchert wrote:

I based it on this:
```
$ for lib in *.so; do echo $lib; readelf --dyn-syms --wide $lib | grep dn_comp; done
libclang_rt.asan-x86_64.so
  1069: 000000000009b880  1263 FUNC    WEAK   DEFAULT   13 __interceptor_dn_comp
  1260: 000000000009b880  1263 FUNC    GLOBAL DEFAULT   13 ___interceptor_dn_comp
  1705: 0000000000082fec     5 FUNC    GLOBAL DEFAULT   13 __interceptor_trampoline_dn_comp
  2138: 0000000000082fec     5 FUNC    WEAK   DEFAULT   13 dn_comp
libclang_rt.dyndd-x86_64.so
libclang_rt.hwasan_aliases-x86_64.so
libclang_rt.hwasan-x86_64.so
libclang_rt.memprof-x86_64.so
   978: 0000000000069b10   203 FUNC    WEAK   DEFAULT   13 __interceptor_dn_comp
  1149: 0000000000069b10   203 FUNC    GLOBAL DEFAULT   13 ___interceptor_dn_comp
  1551: 0000000000061e98     5 FUNC    GLOBAL DEFAULT   13 __interceptor_trampoline_dn_comp
  1938: 0000000000061e98     5 FUNC    WEAK   DEFAULT   13 dn_comp
libclang_rt.nsan-x86_64.so
libclang_rt.scudo_standalone-x86_64.so
libclang_rt.tsan-x86_64.so
  1147: 000000000008e7f0   518 FUNC    WEAK   DEFAULT   13 __interceptor_dn_comp
  1350: 000000000008e7f0   518 FUNC    GLOBAL DEFAULT   13 ___interceptor_dn_comp
  1844: 0000000000070935     5 FUNC    GLOBAL DEFAULT   13 __interceptor_trampoline_dn_comp
  2318: 0000000000070935     5 FUNC    WEAK   DEFAULT   13 dn_comp
libclang_rt.ubsan_minimal-x86_64.so
libclang_rt.ubsan_standalone-x86_64.so
```
But this might be due to my build settings.

https://github.com/llvm/llvm-project/pull/116415