Handle symlinks consistently in extract-from-apex.

Address missed comments on https://r.android.com/1314060.

Test: m installclean && m build-art-target-golem
  before and after CL, compare output of
  `sha1sum out/target/product/armv8/system/*/* | sort -k2`
Bug: 152255951
Change-Id: Id529f27bc458f85bf3dc2cedc276dea7e9fbfb09
diff --git a/Android.mk b/Android.mk
index c46504e..9d76b2d 100644
--- a/Android.mk
+++ b/Android.mk
@@ -581,6 +581,9 @@
 # root.
 # $(1): APEX base name
 # $(2): List of files to extract, with paths relative to the APEX root
+#
+# "cp -d" below doesn't work on Darwin, but this is only used for Golem builds
+# and won't run on mac anyway.
 define extract-from-apex
   apex_root=$(TARGET_OUT)/apex && \
   apex_file=$$apex_root/$(1).apex && \
@@ -594,7 +597,7 @@
   for f in $(2); do \
     sf=$$apex_dir/$$f && \
     df=$(TARGET_OUT)/$$f && \
-    if [ -e $$sf ]; then \
+    if [ -f $$sf -o -h $$sf ]; then \
       mkdir -p $$(dirname $$df) && \
       cp -fd $$sf $$df; \
     fi || exit 1; \