macho: correctly find N_GSYM symbols when parsing symbol stabs

In `ld -r` mode, the linker will emit `N_GSYM` for any defined
external symbols as well as private externals. In the former case,
the thing is easy since `N_EXT` bit will be set in the nlist's type.
In the latter however we will encounter a local symbol with `N_PEXT`
bit set (non-extern, but was private external) which we also need
to include when resolving symbol stabs.

The major change in the logic for parsing symbol stabs per input
object file is that we no longer try to force-resolve a `N_GSYM`
as a global symbol. This was a mistake since every symbol stab
always describes a symbol defined within the parsed input object file.
We then work out if we should forward `N_GSYM` in the output symtab
after we have resolved all symbols, but never before - intel we lack
when initially parsing symbol stabs. Therefore, we simply record
which symbol has a debug symbol stab, and work out its precise type
when emitting output symtab after symbol resolution has been done.

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