openjade: fix for gcc6

The flag -fno-lifetime-dse is required or openjade built
with gcc6 crashes when e.g. trying to build postgresql.

Source http://www.linuxfromscratch.org/blfs/view/svn/pst/openjade.html

srcpkgs/openjade/template

@@ -1,7 +1,7 @@
 # Template file for 'openjade'
 pkgname=openjade
 version=1.3.2
-revision=8
+revision=9
 build_style=gnu-configure
 configure_args="
  --datadir=/usr/share/sgml/openjade
@@ -20,6 +20,8 @@ license="MIT"
 distfiles="${SOURCEFORGE_SITE}/${pkgname}/${pkgname}-$version.tar.gz"
 checksum=1d2d7996cc94f9b87d0c51cf0e028070ac177c4123ecbfd7ac1cb8d0b7d322d1
 
+CXXFLAGS="-fno-lifetime-dse"
+
 pre_configure() {
 	touch configure Makefile.in
 	libtoolize -f