Use buildflags to enable hardening (https://wiki.debian.org/Hardening)

diff --git a/debian/rules b/debian/rules
index 97016e3..791eaca 100755 (executable)
--- a/debian/rules
+++ b/debian/rules
@@ -12,6 +12,9 @@
 
 # Uncomment this to turn on verbose mode.
 export DH_VERBOSE=1
+DPKG_EXPORT_BUILDFLAGS = 1
+include /usr/share/dpkg/default.mk
+
 
 .NOTPARALLEL: