use system provided ccache links

Change-Id: I0860bbd0cf368fc3638b861504ebf642ee9d3807
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/build-data/packages/sample-plugin.mk b/build-data/packages/sample-plugin.mk
index e26ff9d..8aca9ea 100644
--- a/build-data/packages/sample-plugin.mk
+++ b/build-data/packages/sample-plugin.mk
@@ -16,3 +16,4 @@
 sample-plugin_configure_depend = vpp-install
 sample-plugin_CPPFLAGS = $(call installed_includes_fn, vpp)
 sample-plugin_LDFLAGS = $(call installed_libs_fn, vpp)
+sample-plugin_PATH = $(call package_install_dir_fn,vpp)/bin