Replace {device,qti}_kernel_headers only when building inline

Change-Id: Ibbae77a92f5f96da92213d0a0078867ddeeeaf04
diff --git a/cc/cc.go b/cc/cc.go
index 2382cc9..7ea726e 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -2474,8 +2474,10 @@
 				// Replace device_kernel_headers with generated_kernel_headers
 				// for inline kernel building
 				if entry == "device_kernel_headers" || entry == "qti_kernel_headers" {
-					newHeaderLibs = append(newHeaderLibs, "generated_kernel_headers")
-					continue
+					if (ctx.Config().Getenv("INLINE_KERNEL_BUILDING") == "true") {
+						newHeaderLibs = append(newHeaderLibs, "generated_kernel_headers")
+						continue
+					}
 				}
 				newHeaderLibs = append(newHeaderLibs, entry)
 			}