awk: add awk for trees including one-true-awk

Change-Id: I5458a3ecc69b60cc249f598b0250428fc414f34b
diff --git a/prebuilt/Android.mk b/prebuilt/Android.mk
index 4d67e5b..e40ac9f 100644
--- a/prebuilt/Android.mk
+++ b/prebuilt/Android.mk
@@ -31,6 +31,9 @@
         ifneq ($(wildcard system/core/libziparchive/Android.bp),)
             RELINK_SOURCE_FILES += $(TARGET_OUT_EXECUTABLES)/unzip
         endif
+        ifneq ($(wildcard external/one-true-awk/Android.bp),)
+            RELINK_SOURCE_FILES += $(TARGET_OUT_EXECUTABLES)/awk
+        endif
     endif
 endif
 RELINK_SOURCE_FILES += $(TARGET_RECOVERY_ROOT_OUT)/sbin/pigz