exp/wingui: changed to be compatible with windows/amd64

src/pkg/syscall/zsyscall_windows_amd64.go

 // mksyscall_windows.pl syscall_windows.go syscall_windows_amd64.go
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
 package syscall
 
 import "unsafe"
 
 var (
         modkernel32 = NewLazyDLL("kernel32.dll")
         modadvapi32 = NewLazyDLL("advapi32.dll")
@@ skipping 123 matching lines @@
                         errno = int(e1)
                 } else {
                         errno = EINVAL
                 }
         } else {
                 errno = 0
         }
         return
 }
 
-func GetProcAddress(module Handle, procname string) (proc Handle, errno int) {
-        r0, _, e1 := Syscall(procGetProcAddress.Addr(), 2, uintptr(module), uintptr(unsafe.Pointer(StringBytePtr(procname))), 0)
-        proc = Handle(r0)
+func GetProcAddress(module Handle, procname string) (proc uintptr, errno int) {
+        proc, _, e1 := Syscall(procGetProcAddress.Addr(), 2, uintptr(module), uintptr(unsafe.Pointer(StringBytePtr(procname))), 0)
         if proc == 0 {
                 if e1 != 0 {
                         errno = int(e1)
                 } else {
                         errno = EINVAL
                 }
         } else {
                 errno = 0
         }
         return
@@ skipping 1157 matching lines @@
         r0, _, _ := Syscall(procGetIfEntry.Addr(), 1, uintptr(unsafe.Pointer(pIfRow)), 0, 0)
         errcode = int(r0)
         return
 }
 
 func GetAdaptersInfo(ai *IpAdapterInfo, ol *uint32) (errcode int) {
         r0, _, _ := Syscall(procGetAdaptersInfo.Addr(), 2, uintptr(unsafe.Pointer(ai)), uintptr(unsafe.Pointer(ol)), 0)
         errcode = int(r0)
         return
 }