Recognize gccgo error messages:
Recognize gccgo error messages:

interface5.go:15:5: error: incompatible types in assignment
interface5.go:16:5: error: incompatible types in assignment

(Yes, these could be better).

R=rsc
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=22821
CL=22826

h8liu/golang,firebitsbr/golang-old,dsriram/golang,wesolows/golang-old,firebitsbr/golang-old,tv42/old-go,tv42/old-go,dsriram/golang,tianon/debian-golang,bdwalton/debian-golang,h8liu/golang,apparentlymart/golang,wesolows/golang,nightlyone/golang,gnanderson/go,apparentlymart/golang,gnanderson/go,ssrl/go,wesolows/golang-old,nightlyone/golang,apparentlymart/golang,wesolows/golang,tv42/old-go,wesolows/golang,h8liu/golang,wesolows/golang-old,wesolows/golang-old,h8liu/golang,bdwalton/debian-golang,wesolows/golang-old,tv42/old-go,tianon/debian-golang,tianon/debian-golang,ssrl/go,tianon/debian-golang,bdwalton/debian-golang,pombredanne/go-deleteme,ssrl/go,gnanderson/go,wesolows/golang,firebitsbr/golang-old,tv42/old-go,dsriram/golang,firebitsbr/golang-old,tianon/debian-golang,h8liu/golang,pombredanne/go-deleteme,dsriram/golang,gnanderson/go,bdwalton/debian-golang,apparentlymart/golang,bdwalton/debian-golang,wesolows/golang,tv42/old-go,pombredanne/go-deleteme,wesolows/golang,bdwalton/debian-golang,firebitsbr/golang-old,ssrl/go,ssrl/go,nightlyone/golang,gnanderson/go,pombredanne/go-deleteme,pombredanne/go-deleteme,nightlyone/golang,firebitsbr/golang-old,apparentlymart/golang,wesolows/golang-old,tv42/old-go,nightlyone/golang,dsriram/golang,apparentlymart/golang,nightlyone/golang,h8liu/golang,gnanderson/go,dsriram/golang,tianon/debian-golang,tianon/debian-golang,wesolows/golang,ssrl/go,ssrl/go,apparentlymart/golang,nightlyone/golang,firebitsbr/golang-old,h8liu/golang,wesolows/golang-old,bdwalton/debian-golang,firebitsbr/golang-old,pombredanne/go-deleteme,gnanderson/go,tianon/debian-golang,dsriram/golang,pombredanne/go-deleteme,bdwalton/debian-golang