[Bug 210509] libusb.h cannot be included in C++ after r302080

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210509

            Bug ID: 210509
           Summary: libusb.h cannot be included in C++ after r302080
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: usb
          Assignee: freebsd-usb at FreeBSD.org
          Reporter: jkim at FreeBSD.org

Some ports failed to build after r302080, e.g., x11/kde4-workspace.

% cat test.cpp
#include <libusb.h>

int     dummy(void);

int
dummy(void)
{

        return (0);
}
% c++ -c test.cpp
In file included from test.cpp:1:
/usr/include/libusb.h:279:48: error: typedef redefinition with different types
      ('struct libusb_hotplug_callback_handle *' vs
      'libusb_hotplug_callback_handle')
typedef struct libusb_hotplug_callback_handle *libusb_hotplug_callback_handle;
                                               ^
/usr/include/libusb.h:257:8: note: previous definition is here
struct libusb_hotplug_callback_handle;
       ^
1 error generated.
% g++48 -c test.cpp
In file included from test.cpp:1:0:
/usr/include/libusb.h:279:48: error: conflicting declaration 'typedef struct
libusb_hotplug_callback_handle* libusb_hotplug_callback_handle'
 typedef struct libusb_hotplug_callback_handle *libusb_hotplug_callback_handle;
                                                ^
/usr/include/libusb.h:257:8: error: 'struct libusb_hotplug_callback_handle' has
a previous declaration as 'struct libusb_hotplug_callback_handle'
 struct libusb_hotplug_callback_handle;
        ^

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