Fix compilation of poly1305 using go tip - it currently fails with:
./poly1305_arm.s:124: cannot reference SP without a symbol
./poly1305_arm.s:161: cannot reference SP without a symbol
./poly1305_arm.s:162: cannot reference SP without a symbol
asm: asm: assembly of ./poly1305_arm.s failed
Change-Id: I797dcf3641cc881b6cc192034b693ccf58317987
Reviewed-on: https://go-review.googlesource.com/10307
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
user.Current() currently requires cgo - if an error is returned
attempt to get the username from the environment.
R=golang-dev, minux.ma, bradfitz, dave
CC=golang-dev
https://golang.org/cl/6819113