loader: fixes -Werror,-Wdeprecated-non-prototype for clang-15 in pipe-loader

loader: fixes -Werror,-Wdeprecated-non-prototype for clang-15 in pipe-loader

There are multiple error messages, show one of them:
../../src/gallium/auxiliary/pipe-loader/pipe_loader_sw.c:219:54: error: passing arguments to a function without a prototype is deprecated in
all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
         sdev->ws = sdev->dd->winsys[i].create_winsys(drisw_lf);
                                                     ^

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19875>