build: add PCHs for ndnsec and unit tests, fine-tune the existing ones
A full debug+tests build now takes 10% less time with gcc-9 and 21% less
with clang-10. Release builds (without tests) are only marginally faster
with gcc and 7% faster with clang.
Change-Id: I494778fe44cecc6209819a49f48a03f4d16c36af
diff --git a/tools/ndnsec/export.cpp b/tools/ndnsec/export.cpp
index 6d3c260..4429dd4 100644
--- a/tools/ndnsec/export.cpp
+++ b/tools/ndnsec/export.cpp
@@ -23,6 +23,7 @@
#include "util.hpp"
#include "ndn-cxx/security/impl/openssl.hpp"
+#include "ndn-cxx/util/io.hpp"
#include <boost/scope_exit.hpp>