Fixed the WinExec prototype.

diff --git a/loader/module.c b/loader/module.c
index 9123788..5d7c306 100644
--- a/loader/module.c
+++ b/loader/module.c
@@ -872,7 +872,7 @@
 /***********************************************************************
  *           WinExec   (KERNEL32.@)
  */
-HINSTANCE WINAPI WinExec( LPCSTR lpCmdLine, UINT nCmdShow )
+UINT WINAPI WinExec( LPCSTR lpCmdLine, UINT nCmdShow )
 {
     PROCESS_INFORMATION info;
     STARTUPINFOA startup;