Revert "Revert "Support filegroup in exclude_srcs""

This reverts commit 606e9de344fae07473dd79e5ac556886a72035de.

Reason for revert: <try to fix the broken build yesterday>

Change-Id: I2963b9af63c7c7398159e5e9a1e448266e1c81d5
Test: unittest
diff --git a/cc/compiler.go b/cc/compiler.go
index 0d8e3a1..dd1cdee 100644
--- a/cc/compiler.go
+++ b/cc/compiler.go
@@ -202,6 +202,7 @@
 	deps.GeneratedHeaders = append(deps.GeneratedHeaders, compiler.Properties.Generated_headers...)
 
 	android.ExtractSourcesDeps(ctx, compiler.Properties.Srcs)
+	android.ExtractSourcesDeps(ctx, compiler.Properties.Exclude_srcs)
 
 	if compiler.hasSrcExt(".proto") {
 		deps = protoDeps(ctx, deps, &compiler.Proto, Bool(compiler.Properties.Proto.Static))