goyacc: fix units.y build breakage This breakage is mainly due to API changes in pkg. (e.g., package utf8 moved to unicode/utf8;        remove of strconv.Atof64;        change character type from int to rune.) Also correct the usage comment.
goyacc: fix units.y build breakage
This breakage is mainly due to API changes in pkg.
(e.g., package utf8 moved to unicode/utf8;
       remove of strconv.Atof64;
       change character type from int to rune.)
Also correct the usage comment.

This fixes issue 2646.
PS: I don't change the goyacc.go, because I think token type
    should not be force to rune.

R=golang-dev, adg, rogpeppe, r, r
CC=golang-dev
http://codereview.appspot.com/5502093

Committer: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

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