Remove netbsd/arm support for now
There are crossbuild errors on netbsd/arm with go1.8. Assuming there is
only a small minority of people running netbsd on ARM processors,
disabling these builds is the fastest workaround.
@@ -26,7 +26,6 @@ crossbuild:
- netbsd/386
- linux/arm
- linux/arm64
- - netbsd/arm
# Temporarily deactivated as this does not currently build with promu.
#- linux/mips64
#- linux/mips64le
