[Pal/Linux-SGX] Remove unused pal_handle.file.{pass,append} fields

Pal/src/host/Linux-SGX/db_files.c

@@ -58,8 +58,6 @@ static int file_open(PAL_HANDLE* handle, const char* type, const char* uri, int
     SET_HANDLE_TYPE(hdl, file);
     HANDLE_HDR(hdl)->flags |= RFD(0) | WFD(0) | WRITABLE(0);
     hdl->file.fd     = fd;
-    hdl->file.append = 0;
-    hdl->file.pass   = 0;
     char* path       = (void*)hdl + HANDLE_SIZE(file);
     int ret;
     if ((ret = get_norm_path(uri, path, &len)) < 0) {

Pal/src/host/Linux-SGX/db_main.c

@@ -102,8 +102,6 @@ static PAL_HANDLE setup_dummy_file_handle (const char * name)
     SET_HANDLE_TYPE(handle, file);
     HANDLE_HDR(handle)->flags |= RFD(0);
     handle->file.fd = PAL_IDX_POISON;
-    handle->file.append = 0;
-    handle->file.pass = 0;
 
     char * path = (void *) handle + HANDLE_SIZE(file);
     int ret = get_norm_path(name, path, &len);

Pal/src/host/Linux-SGX/pal_host.h

@@ -94,8 +94,6 @@ typedef struct pal_handle
 
         struct {
             PAL_IDX fd;
-            PAL_BOL append;
-            PAL_BOL pass;
             PAL_STR realpath;
             PAL_NUM total;
             PAL_PTR stubs;