ssiapi: Use c++14 standard

It depends on std::auto_ptr which is gone with c++17 therefore pin to
c++14 until auto_ptr is replaced with something else e.g. unique_ptr

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-support/ssiapi/ssiapi_1.3.0.bb

@@ -29,6 +29,8 @@ S ="${WORKDIR}/${BPN}.${PV}"
 
 inherit autotools
 
+CXXFLAGS += "-std=gnu++14"
+
 do_configure:prepend(){
     ${S}/autogen.sh
 }