LDFLAGS: Add noexecstack, now and relro.

Signed-off-by: Philip Tricca <philip.b.tricca@intel.com>
diff --git a/configure.ac b/configure.ac
index 46360d5..3d7fd28 100644
--- a/configure.ac
+++ b/configure.ac
@@ -58,6 +58,9 @@
 add_cflag([-fpic])
 add_cflag([-fPIC])
 add_ldflag([-Wl,--no-undefined])
+add_ldflag([-Wl,-z,noexecstack])
+add_ldflag([-Wl,-z,now])
+add_ldflag([-Wl,-z,relro])
 
 AC_SUBST([EXTRA_CFLAGS])
 AC_SUBST([EXTRA_LDFLAGS])