Fix for Google3 roll failure

Bug: skia:
Change-Id: I19ba8a0fba290bd35622dfa18efdaa1cada666ee
Reviewed-on: https://skia-review.googlesource.com/43640
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/public.bzl b/public.bzl
index cb3cdfc..c7e47d5 100644
--- a/public.bzl
+++ b/public.bzl
@@ -116,7 +116,9 @@
 
         # Defines main.
         "src/sksl/SkSLMain.cpp",
-        "src/sksl/lex/Main.cpp",
+
+        # Only used to regenerate the lexer
+        "src/sksl/lex/*",
     ],
 )