Add bsymbolic flags to linux linker
Add bsymbolic flags to linux linker

The problem with not having these flags are:

`libhostfxr.so` and `libhostpolicy.so` would still keep using common functions that are defined in `dotnet.exe` effectively void a servicing override. Of course, servicing of common code would service both `dotnet.exe` and `libhostpolicy.so`, but this is needed to match Windows for consistency and is easier to reason about.
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