$ cat x.go
package main

import (
        _ "unsafe"
)

//go:cgo_import_dynamic libc_getpid getpid "libc.so"
//go:cgo_import_dynamic libc_kill kill "libc.so"
//go:cgo_import_dynamic libc_close close "libc.so"
//go:cgo_import_dynamic libc_open open "libc.so"

//go:linkname libc_getpid libc_getpid
//go:linkname libc_kill libc_kill
//go:linkname libc_open libc_open
//go:linkname libc_close libc_close

func trampoline()

func main() {
        trampoline()
}
$ cat x.s
TEXT ·trampoline(SB),0,$0
        CALL    libc_getpid(SB)
        CALL    libc_kill(SB)
        CALL    libc_open(SB)
        CALL    libc_close(SB)
        RET

$ go version     
go version devel +bcda68447b Mon May 25 21:01:14 2020 +0000 openbsd/amd64
$ go build -o x  
$ readelf -a x | grep NEEDED  
 0x0000000000000001 (NEEDED)             Shared library: [libc.so]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so]