test: Match gccgo error messages.
test: Match gccgo error messages.

gcc conventionally does not upper case in error messages.

char_lit1.go:13: error: invalid unicode code point 0xd800
char_lit1.go:14: error: invalid unicode code point 0xd999
char_lit1.go:15: error: invalid unicode code point 0xdc01
char_lit1.go:16: error: invalid unicode code point 0xdddd
char_lit1.go:17: error: invalid unicode code point 0xdfff
char_lit1.go:20: error: invalid unicode code point 0x110000
char_lit1.go:22: error: invalid unicode code point 0x110000
char_lit1.go:23: error: invalid unicode code point 0xffffffff

R=rsc
CC=golang-dev
http://codereview.appspot.com/2040042

dsriram/golang,gnanderson/go,apparentlymart/golang,apparentlymart/golang,ssrl/go,pombredanne/go-deleteme,tv42/old-go,ssrl/go,apparentlymart/golang,tv42/old-go,gnanderson/go,ssrl/go,h8liu/golang,gnanderson/go,dsriram/golang,apparentlymart/golang,h8liu/golang,ssrl/go,tv42/old-go,dsriram/golang,pombredanne/go-deleteme,h8liu/golang,apparentlymart/golang,gnanderson/go,apparentlymart/golang,gnanderson/go,ssrl/go,gnanderson/go,dsriram/golang,dsriram/golang,pombredanne/go-deleteme,tv42/old-go,ssrl/go,tv42/old-go,ssrl/go,pombredanne/go-deleteme,dsriram/golang,dsriram/golang,h8liu/golang,pombredanne/go-deleteme,tv42/old-go,gnanderson/go,pombredanne/go-deleteme,h8liu/golang,h8liu/golang,apparentlymart/golang,h8liu/golang,pombredanne/go-deleteme,tv42/old-go