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2021-06-26T16:29:33.810823Z
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linker_set: fix globl/weak symbol redefinitions to work on clang 12

In clang 12.0.0.rc2, going from weak to global is now a hard error:

```
/usr/src/stand/libsa/amd64/_setjmp.S:67:25: error: _longjmp changed binding to STB_GLOBAL
.text; .p2align 4,0x90; .globl _longjmp; .type _longjmp,@function; _longjmp:; .cfi_startproc
```

And the other way is a warning, but we have -Werror:

```
error: __start_set_Xcommand_set changed binding to STB_WEAK [-Werror,-Winline-asm]
error: __stop_set_Xcommand_set changed binding to STB_WEAK [-Werror,-Winline-asm]
```

ref: https://reviews.llvm.org/D90108

Reviewed By:	arichardson
MFC after:	1 week
Differential Revision: https://reviews.freebsd.org/D29159

(cherry picked from commit 32231805fbe2b9438c2de50c229b43c016207a08)

Git Hash:   f2ef124469aef4ba17fb201d5412b04cc298bd2a
Git Author: greg@unrelenting.technology
END