--goroot not used for gofmt

[schmurfy]

While trying to compile 0.8.0-rc.2:

$ ./configure --with-goroot=/usr/local/go
checking for protoc... /usr/local/bin/protoc
checking for go... /usr/local/go/bin/go
checking for gofmt... notfound
configure: error: Please install GO (or make sure it's on your path) before trying to build Influxdb

But gofmt is all cozy next to its friends:

$ls -l /usr/local/go/bin/go*
/usr/local/go/bin/go  /usr/local/go/bin/godoc  /usr/local/go/bin/gofmt

By a quick look at configure.ac I think goroot is just not used to build the gofmt path but I hate autoconf and it hates me so I am sure you will come with a better fix than what I could do ;)