syscall: avoiding _getdirentries64 on darwin broke 386 build

[bradfitz]

@randall77, darwin/386 is broken.

It's a silly port (and not long for the macOS world), but Russ likes to keep it around for now for being able to hack on 386 stuff on Mac laptops.

https://build.golang.org/log/9942f145ea079bf006f9762a569684fc28eb2980

darwin-386-10_11 at 9da6530faab0a58c4c4e02b2f3f4a5c754dcbd4e

:: Running /var/folders/dx/k53rs1s93538b4x20g46cj_w0000gn/T/workdir/go/src/make.bash with args ["/var/folders/dx/k53rs1s93538b4x20g46cj_w0000gn/T/workdir/go/src/make.bash"] and env ["TERM_PROGRAM=Apple_Terminal" "TERM=xterm-256color" "SHELL=/bin/bash" "TMPDIR=/var/folders/dx/k53rs1s93538b4x20g46cj_w0000gn/T/" "Apple_PubSub_Socket_Render=/private/tmp/com.apple.launchd.hJtBX3QjrS/Render" "TERM_PROGRAM_VERSION=361.1" "TERM_SESSION_ID=EEF4530A-03E6-4062-A879-117B5A3DE6A0" "USER=gopher" "SSH_AUTH_SOCK=/private/tmp/com.apple.launchd.9ygRbm4U9F/Listeners" "__CF_USER_TEXT_ENCODING=0x1F5:0x0:0x0" "PATH=/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin" "PWD=/Users/gopher" "LANG=en_US.UTF-8" "XPC_FLAGS=0x0" "XPC_SERVICE_NAME=0" "SHLVL=2" "HOME=/Users/gopher" "LOGNAME=gopher" "SECURITYSESSIONID=186a7" "GO_BUILDER_ENV=macstadium_vm" "GO_STAGE0_NET_DELAY=300ms" "GO_STAGE0_DL_DELAY=400ms" "WORKDIR=/var/folders/dx/k53rs1s93538b4x20g46cj_w0000gn/T/workdir" "GOROOT_BOOTSTRAP=/var/folders/dx/k53rs1s93538b4x20g46cj_w0000gn/T/workdir/go1.4" "GO_BUILDER_NAME=darwin-386-10_11" "GOROOT_BOOTSTRAP=/Users/gopher/go1.4" "GOARCH=386" "GOHOSTARCH=386" "GOBIN=" "TMPDIR=/var/folders/dx/k53rs1s93538b4x20g46cj_w0000gn/T/workdir/tmp" "GOCACHE=/var/folders/dx/k53rs1s93538b4x20g46cj_w0000gn/T/workdir/gocache"] in dir /var/folders/dx/k53rs1s93538b4x20g46cj_w0000gn/T/workdir/go/src

Building Go cmd/dist using /Users/gopher/go1.4.
Building Go toolchain1 using /Users/gopher/go1.4.
Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1.
Building Go toolchain2 using go_bootstrap and Go toolchain1.
dyld: Symbol not found: _fdopendir$INODE64
  Referenced from: /private/var/folders/dx/k53rs1s93538b4x20g46cj_w0000gn/T/workdir/go/pkg/tool/darwin_386/go_bootstrap
  Expected in: flat namespace

go tool dist: FAILED: /private/var/folders/dx/k53rs1s93538b4x20g46cj_w0000gn/T/workdir/go/pkg/tool/darwin_386/go_bootstrap install -gcflags=all= -ldflags=all= -i cmd/asm cmd/cgo cmd/compile cmd/link: signal: trace/BPT trap

[gopherbot]

Change https://golang.org/cl/170837 mentions this issue: syscall: don't use INODE64 for fdopendir on darwin/386