mesa: Make gl_program::InputsRead 64 bits.

Make gl_program::InputsRead a 64 bits bitfield.
Adapt the intel and radeon driver to handle a 64 bits
InputsRead value.

Signed-off-by: Mathias Froehlich <Mathias.Froehlich@web.de>
Reviewed-by: Eric Anholt <eric@anholt.net>

src/mesa/main/context.c

@@ -798,7 +798,7 @@ init_attrib_groups(struct gl_context *ctx)
    ctx->NewState = _NEW_ALL;
    ctx->ErrorValue = (GLenum) GL_NO_ERROR;
    ctx->ResetStatus = (GLenum) GL_NO_ERROR;
-   ctx->varying_vp_inputs = ~0;
+   ctx->varying_vp_inputs = VERT_BIT_ALL;
 
    return GL_TRUE;
 }