build: remove -bind_at_load usage

This is deprecated on macOS:
```bash
ld: warning: -bind_at_load is deprecated on macOS
```
and likely redundant anyways, given the behaviour of dyld3.

Unfortunately libtool is still injecting a `-bind_at_load`:
```bash
	# Don't allow lazy linking, it breaks C++ global constructors
	# But is supposedly fixed on 10.4 or later (yay!).
	if test CXX = "$tagname"; then
	  case ${MACOSX_DEPLOYMENT_TARGET-10.0} in
	    10.[0123])
	      func_append compile_command " $wl-bind_at_load"
	      func_append finalize_command " $wl-bind_at_load"
	    ;;
	  esac
	fi
```
so this doesn't remove all the warnings, but removes us as a potential
source of them.

Note that anywhere the ld64 warnings are being emitted, we are already
not adding this flag to our hardened ldflags, because of `-Wl,-fatal_warnings`.

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