dpdk: fix building debs from stable dpdk tarballs (VPP-1259)

Change-Id: I9585603e9fa1904658d84d226bd50370f1dbc889
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/dpdk/deb/debian/rules b/dpdk/deb/debian/rules
index 98b1048..b9a5863 100755
--- a/dpdk/deb/debian/rules
+++ b/dpdk/deb/debian/rules
@@ -8,7 +8,7 @@
 export DPDK_BUILD_DIR=$(CURDIR)/_build
 export DPDK_INSTALL_DIR=$(CURDIR)/debian/tmp/usr
 
-SRC=_build/dpdk-$(BASE_VER)
+SRC=$(wildcard _build/dpdk*$(BASE_VER))
 
 MAKE_ARGS=-C ..