Fix sources to include their respective header

src/Buffer.cpp

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include <znc/Buffer.h>
 #include <znc/znc.h>
 #include <znc/User.h>
 

src/Client.cpp

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include <znc/Client.h>
 #include <znc/Chan.h>
 #include <znc/IRCSock.h>
 #include <znc/User.h>

src/ClientCommand.cpp

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include <znc/Client.h>
 #include <znc/Chan.h>
 #include <znc/FileUtils.h>
 #include <znc/IRCNetwork.h>

src/HTTPSock.cpp

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include <znc/HTTPSock.h>
 #include <znc/FileUtils.h>
 #include <znc/znc.h>
 #include <iomanip>

src/Listener.cpp

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include <znc/Listener.h>
 #include <znc/znc.h>
 
 CListener::~CListener() {

src/Nick.cpp

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include <znc/Nick.h>
 #include <znc/Chan.h>
 #include <znc/IRCSock.h>
 #include <znc/IRCNetwork.h>

src/Socket.cpp

@@ -16,6 +16,7 @@
 
 #include <random>
 
+#include <znc/Socket.h>
 #include <znc/User.h>
 #include <znc/IRCNetwork.h>
 #include <znc/SSLVerifyHost.h>

src/ZNCString.cpp

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include <znc/ZNCString.h>
 #include <znc/FileUtils.h>
 #include <znc/Utils.h>
 #include <znc/MD5.h>

src/znc.cpp

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include <znc/znc.h>
 #include <znc/FileUtils.h>
 #include <znc/IRCSock.h>
 #include <znc/Server.h>