Make gallium compile in win32.

Use FREE, MALLOC, CALLOC, GETENV wrappers.
Silence compiler warnings.
Add proper copyrights.

src/mesa/pipe/softpipe/sp_state_sampler.c

@@ -38,7 +38,7 @@ void *
 softpipe_create_sampler_state(struct pipe_context *pipe,
                               const struct pipe_sampler_state *sampler)
 {
-   struct pipe_sampler_state *state = malloc(sizeof(struct pipe_sampler_state));
+   struct pipe_sampler_state *state = MALLOC( sizeof(struct pipe_sampler_state) );
    memcpy(state, sampler, sizeof(struct pipe_sampler_state));
    return state;
 }
@@ -60,7 +60,7 @@ void
 softpipe_delete_sampler_state(struct pipe_context *pipe,
                               void *sampler)
 {
-   free(sampler);
+   FREE( sampler );
 }