shader: bump input/output count to 64

With tessellation we can have 32 patch varyings on top of the old limit

Tested-by: Elie Tournier <elie.tournier@collabora.com>
Reviewed-by: Elie Tournier <elie.tournier@collabora.com>
Tested-by: Jakob Bornecrantz <jakob@collabora.com>

src/vrend_shader.c

@@ -113,9 +113,9 @@ struct dump_ctx {
    uint32_t num_interps;
    uint32_t num_inputs;
    uint32_t attrib_input_mask;
-   struct vrend_shader_io inputs[35];
+   struct vrend_shader_io inputs[64];
    uint32_t num_outputs;
-   struct vrend_shader_io outputs[35];
+   struct vrend_shader_io outputs[64];
    uint32_t num_system_values;
    struct vrend_shader_io system_values[32];