cmd/ld: don't generate DW_AT_type attr for unsafe.Pointer to match gcc
gcc generates only attr DW_AT_byte_size for DW_TAG_pointer_type of "void
but we used to also generate DW_AT_type pointing to imaginary
type "void", which confuses some gdb.
This change makes old Apple gdb 6.x (specifically, Apple version
accepts our binary without issue like this:
(gdb) b 'main.main'
Die: DW_TAG_unspecified_type (abbrev = 10, offset = 47079)
has children: FALSE
DW_AT_name (DW_FORM_string) string: "void"
Dwarf Error: Cannot find type of die [in module
Special thanks to Russ Cox for pointing out the problem in comment #6 of
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