put gcc-preinclude.h in CFLAGS as well

scripts/build_against_node.sh

@@ -20,7 +20,7 @@ if [[ ${COVERAGE} == true ]]; then
     ./py-local/bin/cpp-coveralls --exclude node_modules --exclude tests --build-root build --gcov-options '\-lp' --exclude docs --exclude build/Release/obj/gen --exclude deps  > /dev/null
 else
     echo "building binaries for publishing"
-    CXXFLAGS="${CXXFLAGS:-} -include $(pwd)/src/gcc-preinclude.h" V=1 npm install --build-from-source  --clang=1
+    CFLAGS="${CFLAGS:-} -include $(pwd)/src/gcc-preinclude.h" CXXFLAGS="${CXXFLAGS:-} -include $(pwd)/src/gcc-preinclude.h" V=1 npm install --build-from-source  --clang=1
     nm lib/binding/*/node_sqlite3.node | grep "GLIBCXX_" | c++filt  || true
     nm lib/binding/*/node_sqlite3.node | grep "GLIBC_" | c++filt || true
     npm test