Add SEE ALSO for cgcc in sparse manpage

Signed-off-by: Josh Triplett <josh@freedesktop.org>
diff --git a/sparse.1 b/sparse.1
index 7e0a031..7a39d85 100644
--- a/sparse.1
+++ b/sparse.1
@@ -254,6 +254,9 @@
 
 Sparse does not issue these warnings by default.
 .
+.SH SEE ALSO
+.BR cgcc (1)
+.
 .SH HOMEPAGE
 http://www.kernel.org/pub/software/devel/sparse/
 .