gallium: Move -DHAVE_PIPE_LOADER_DRI and -DHAVE_PIPE_LOADER_KMS to be pre_args

gallium:  Move -DHAVE_PIPE_LOADER_DRI and -DHAVE_PIPE_LOADER_KMS to be pre_args

There is non pipe-loader source code depends on it.
After doing this, we found that shared library pipe_swrast depends on libswdri
The error message is:
src/gallium/targets/pipe-loader/pipe_swrast.so.p/pipe_swrast.c.o:pipe_swrast.c:swrast_driver_descriptor: error: undefined reference to 'dri_create_sw_winsys'
src/gallium/targets/pipe-loader/pipe_swrast.so.p/pipe_swrast.c.o:pipe_swrast.c:swrast_driver_descriptor: error: undefined reference to 'kms_dri_create_winsys'

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17784>