Revert "global.h: Use forward-declarations to reduce number of dependencies"

This reverts commit 4bc6e43ad4.

src/system/httptool.cpp

@@ -18,7 +18,7 @@
 	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA
 */
 
-#include <cstring>
+
 #include <system/httptool.h>
 
 #include <curl/curl.h>
@@ -30,6 +30,7 @@
 
 #include <global.h>
 
+
 CHTTPTool::CHTTPTool()
 {
 	statusViewer = NULL;