cmd/cc/cc.h: Add a #pragma for %S used (only) in cmd/cc/sub.c. Eliminates a format consistency warning.
cmd/cc/cc.h: Add a #pragma for %S used (only) in cmd/cc/sub.c.
Eliminates a format consistency warning.

R=gloang-dev, r
CC=golang-dev
https://codereview.appspot.com/8217043

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

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