Explicitely include all needed botan headers

Most importantely, include parsing.h, since read_cfg is not implicitely
included anymore in botan 2.3, and that does not compile.

Also do not included botan.h anymore, since it’s deprecated in botan 2.3

fix #3296

src/network/credentials_manager.cpp

@@ -5,6 +5,7 @@
 #include <network/credentials_manager.hpp>
 #include <logger/logger.hpp>
 #include <botan/tls_exceptn.h>
+#include <botan/data_src.h>
 #include <config/config.hpp>
 
 /**

src/network/credentials_manager.hpp

@@ -4,7 +4,8 @@
 
 #ifdef BOTAN_FOUND
 
-#include <botan/botan.h>
+#include <botan/credentials_manager.h>
+#include <botan/certstor.h>
 #include <botan/tls_client.h>
 
 class TCPSocketHandler;

src/network/tcp_socket_handler.cpp

@@ -13,6 +13,7 @@
 
 #ifdef BOTAN_FOUND
 # include <botan/hex.h>
+# include <botan/auto_rng.h>
 # include <botan/tls_exceptn.h>
 # include <config/config.hpp>
 # include <utils/dirname.hpp>

src/network/tcp_socket_handler.hpp

@@ -21,7 +21,6 @@
 #ifdef BOTAN_FOUND
 
 # include <botan/types.h>
-# include <botan/botan.h>
 # include <botan/tls_session_manager.h>
 # include <network/tls_policy.hpp>
 

src/network/tls_policy.cpp

@@ -8,6 +8,8 @@
 
 #include <network/tls_policy.hpp>
 #include <logger/logger.hpp>
+#include <botan/parsing.h>
+#include <botan/exceptn.h>
 
 bool BiboumiTLSPolicy::load(const std::string& filename)
 {