runtime: fix nacl/amd64p32 build

Update issue 8675
Fixes nacl/amd64p32 build.

TBR=khr
CC=golang-codereviews
https://codereview.appspot.com/141140045
cmd/dist: remove goc2c

After the three pending CLs listed below, there will be no more .goc files.

134580043	runtime: move stubs.goc code into runtime.c
133670043	runtime: fix windows syscalls for copying stacks
141180043	runtime: eliminate Go -> C -> block paths for Solaris

LGTM=bradfitz
R=golang-codereviews, bradfitz, dave
CC=golang-codereviews, iant, r
https://codereview.appspot.com/132680043
build: fix windows make.bat

The Unix make.bash builds cmd/dist from *.c.
make.bat apparently does not.

TBR=r
CC=golang-codereviews
https://codereview.appspot.com/137280043
liblink: fix arm wrapper prologue

Fixes arm build.

TBR=khr
CC=golang-codereviews
https://codereview.appspot.com/132700043
crypto/tls: print unexpected error in test

Maybe will help us understand Solaris build failure.

TBR=aram
CC=golang-codereviews
https://codereview.appspot.com/139290043