cmd/link/internal/ld: unconditionally use posix_fallocate on FreeBSD

Now that Go 1.24 is the minimum bootstrap toolchain we can drop the
version dependent use of posix_fallocate on FreeBSD.

For golang#69315

Change-Id: Ie0c7ca67e3c21138d690e1e11a12172d52619493
Reviewed-on: https://go-review.googlesource.com/c/go/+/699735
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>
Auto-Submit: Tobias Klauser <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>

Author: tklauser

src/cmd/link/internal/ld/fallocate_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build darwin || (freebsd && go1.21) || linux || (netbsd && go1.25)
+//go:build darwin || freebsd || linux || (netbsd && go1.25)
 
 package ld
 

src/cmd/link/internal/ld/outbuf_bsd.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build (freebsd && go1.21) || (netbsd && go1.25)
+//go:build freebsd || (netbsd && go1.25)
 
 package ld
 

src/cmd/link/internal/ld/outbuf_nofallocate.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build !darwin && !(freebsd && go1.21) && !linux && !(netbsd && go1.25)
+//go:build !darwin && !freebsd && !linux && !(netbsd && go1.25)
 
 package ld