Make tests assume ANDROID_ROOT is not /system.

This is to enable better chroot-like testing.

Change-Id: I943c68b0ebcdab2f107f808b466ac694085255aa
diff --git a/test/etc/run-test-jar b/test/etc/run-test-jar
index 8dd7573..1c44958 100755
--- a/test/etc/run-test-jar
+++ b/test/etc/run-test-jar
@@ -364,6 +364,7 @@
              export ANDROID_ROOT=$ANDROID_ROOT && \
              $mkdir_cmdline && \
              export LD_LIBRARY_PATH=$LD_LIBRARY_PATH && \
+             export PATH=$ANDROID_ROOT/bin:$PATH && \
              $dex2oat_cmdline && \
              $dalvikvm_cmdline"