Merge "Add missing export/unexport directives" am: 67e72529c4

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/1513335

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I16d3f4210df3d1e2d59a5785422ad732546935e4
diff --git a/androidmk/parser/parser.go b/androidmk/parser/parser.go
index c14910a..5afef65 100644
--- a/androidmk/parser/parser.go
+++ b/androidmk/parser/parser.go
@@ -553,12 +553,14 @@
 	"else",
 	"endef",
 	"endif",
+	"export",
 	"ifdef",
 	"ifeq",
 	"ifndef",
 	"ifneq",
 	"include",
 	"-include",
+	"unexport",
 }
 
 var functions = [...]string{