debian/rules: use the new sysconfdir configuration setting

Configuration file support requires setting --sysconfdir=/etc/ if your
distribution expects mkfs.xfs.d directory to be in /etc.

Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
diff --git a/debian/rules b/debian/rules
index cb4fa22..599d799 100755
--- a/debian/rules
+++ b/debian/rules
@@ -20,9 +20,9 @@
 
 options = export DEBUG=-DNDEBUG DISTRIBUTION=debian \
 	  INSTALL_USER=root INSTALL_GROUP=root \
-	  LOCAL_CONFIGURE_OPTIONS="--enable-readline=yes --enable-blkid=yes --disable-ubsan --disable-addrsan --disable-threadsan --enable-lto" ;
+	  LOCAL_CONFIGURE_OPTIONS="--enable-readline=yes --enable-blkid=yes --disable-ubsan --disable-addrsan --disable-threadsan --enable-lto --sysconfdir=/etc/" ;
 diopts  = $(options) \
-	  export OPTIMIZER=-Os LOCAL_CONFIGURE_OPTIONS="--enable-gettext=no --disable-ubsan --disable-addrsan --disable-threadsan --enable-lto" ;
+	  export OPTIMIZER=-Os LOCAL_CONFIGURE_OPTIONS="--enable-gettext=no --disable-ubsan --disable-addrsan --disable-threadsan --enable-lto --sysconfdir=/etc/" ;
 checkdir = test -f debian/rules
 
 build: build-arch build-indep