svga: change svga_hw_view_state::dirty to boolean
svga: change svga_hw_view_state::dirty to boolean

Since it's a true/false value.

Reviewed-by: Charmaine Lee <67ce69700661ea856134ddb10419a330e5f037d7@vmware.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler