Added handle_t type to server interface so that we can make handles
pointers later on.
Always use 0 to signal invalid handle in server requests.

diff --git a/loader/module.c b/loader/module.c
index a50b5bd..d566e4f 100644
--- a/loader/module.c
+++ b/loader/module.c
@@ -1089,7 +1089,7 @@
     if ( !MODULE_GetBinaryType( hFile, name, &type ) )
     {
         CloseHandle( hFile );
-        retv = PROCESS_Create( -1, name, tidy_cmdline, lpEnvironment, 
+        retv = PROCESS_Create( 0, name, tidy_cmdline, lpEnvironment, 
                                lpProcessAttributes, lpThreadAttributes,
                                bInheritHandles, dwCreationFlags,
                                lpStartupInfo, lpProcessInfo, lpCurrentDirectory );