Add missing headers

Most of these were found by breaking every redfish class handler into
its own compile unit:

When that's done, these missing headers become compile errors. We
should just fix them.

In addition, this allows us to enable automatic header checking in
clang-tidy using misc-header-cleaner. Because the compiler can now
"see" all the defines, it no longer tries to remove headers that it
thinks are unused.

[1] https://github.com/openbmc/bmcweb/commit/4fdee9e39e9f03122ee16a6fb251a380681f56ac

Tested: Code compiles.

Change-Id: Ifa27ac4a512362b7ded7cc3068648dc4aea6ad7b
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/include/pam_authenticate.hpp b/include/pam_authenticate.hpp
index c06b7e9..9854df6 100644
--- a/include/pam_authenticate.hpp
+++ b/include/pam_authenticate.hpp
@@ -2,11 +2,10 @@
 
 #include <security/pam_appl.h>
 
-#include <boost/utility/string_view.hpp>
-
 #include <cstring>
 #include <memory>
 #include <span>
+#include <string_view>
 
 // function used to get user input
 inline int pamFunctionConversation(int numMsg, const struct pam_message** msg,