binutils for musl

[程智星]

hi，friend：

When I use Musl as the base library to compile the yocto embedded system, the following error will be reported:

= {anonymous}::Target_i386; Scan = {anonymous}::Target_i386::Scan; Classify_reloc = {anonymous}::Target_i386::Classify_reloc; size_t = long unsigned int]':

| ../../gold/i386.cc:2624:19:   required from here

| ../../gold/gc.h:250:34: error: invalid cast from type 'std::nullptr_t' to type 'gold::Relobj*'

|   250 |   (*secvec).push_back(Section_id(reinterpret_cast<Relobj*>(NULL), 0));

|       |                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

| ../../gold/gc.h:332:34: error: invalid cast from type 'std::nullptr_t' to type 'gold::Relobj*'

|   332 |   (*secvec).push_back(Section_id(reinterpret_cast<Relobj*>(NULL), 0));




I think the reason for this problem is:

In glibc, NULL is defined as (void *) 0, so reinterpret_cast is used When performs Type conversion, it is legal to convert NULL to Relobj *. But in Musl, NULL is defined as nullptr, while reinterpret_cast is not safe for cast to convert nullptr to a specific pointer type, so compilation will report an error.




So I used static_cast Replace reinterpret_cast , specific patch as attached;  can this  be integrated into our source code? Or do you have a better solution to address this error?

Looking forward to your reply！
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