Allow apis from exported shared library headers as well, while dumping abi.

header-abi-diff has switched to recursive diffing of types and can
diff more accurately if types included in re-exported shared library
headers are included as well.

Bug: 62060883

Test: make -j64, android.hardware.light@2.0.so.lsdump contains structs
from libcutils as well (libcutils' headers are re-exported by
android.hardware.light@2.0)

Change-Id: I814819e4f7258b4b380350fe8ad0ccf8dbd5ce5c
diff --git a/cc/library.go b/cc/library.go
index 4a173a5..1537fd4 100644
--- a/cc/library.go
+++ b/cc/library.go
@@ -323,9 +323,7 @@
 	// from a source. We extract the include flags exported by a library.
 	// This includes the flags exported which are re-exported from static
 	// library dependencies, exported header library dependencies and
-	// generated header dependencies. Re-exported shared library include
-	// flags are not in this set since shared library dependencies will
-	// themselves be included in the vndk. -isystem headers are not included
+	// generated header dependencies. -isystem headers are not included
 	// since for bionic libraries, abi-filtering is taken care of by version
 	// scripts.
 	var exportedIncludes []string