Move CExecSock to ExecSock.h

As a result, Utils.h no longer has to include Socket.h and lots of stuff breaks.

Due to a severe case of lazyness, some of the code for CExecSock is still in
Utils.cpp. Feel free to fix if you really have to.

Signed-off-by: Uli Schlachter <psychon@znc.in>

FileUtils.cpp

@@ -7,12 +7,15 @@
  */
 
 #include "FileUtils.h"
+#include "ExecSock.h"
 #include "Utils.h"
+#include "ZNCDebug.h"
+#include <errno.h>
+#include <fcntl.h>
+#include <pwd.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/wait.h>
-#include <fcntl.h>
-#include <pwd.h>
 
 #ifndef HAVE_LSTAT
 #  define lstat(a, b)	stat(a, b)