bp2build: remove header globs in generated srcs.

Not needed anymore for bp2build-incremental since https://android-review.googlesource.com/q/topic:no-include-check.

Not needed for mixed builds either, since cc compile actions aren't sandboxed.

Fixes: 186488830
Test: treehugger and go tests

Change-Id: Ib5d4908dcce6bf910a653c457bb251d726e717d4
diff --git a/cc/library_headers.go b/cc/library_headers.go
index f2cb52b..0aba8de 100644
--- a/cc/library_headers.go
+++ b/cc/library_headers.go
@@ -142,14 +142,13 @@
 		return
 	}
 
-	exportedIncludes, exportedHdrs := bp2BuildParseExportedIncludes(ctx, module)
+	exportedIncludes := bp2BuildParseExportedIncludes(ctx, module)
 	compilerAttrs := bp2BuildParseCompilerProps(ctx, module)
 	linkerAttrs := bp2BuildParseLinkerProps(ctx, module)
 
 	attrs := &bazelCcLibraryHeadersAttributes{
 		Copts:    compilerAttrs.copts,
 		Includes: exportedIncludes,
-		Hdrs:     exportedHdrs,
 		Deps:     linkerAttrs.deps,
 	}