Turn on -Wnewline-eof.

I don't know _why_ Clang would like these .inc files to have a newline at the end of the file, but it seems a harmless way to silence the warning.


BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2711

Change-Id: I6c530ee5096c48c91ddf322aca916e70a0dd770b
Reviewed-on: https://skia-review.googlesource.com/2711
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/sksl/sksl.include b/src/sksl/sksl.include
index bf35f22..4fd5511 100644
--- a/src/sksl/sksl.include
+++ b/src/sksl/sksl.include
@@ -540,4 +540,5 @@
 void memoryBarrierImage();
 void groupMemoryBarrier();
 
-)
\ No newline at end of file
+)
+