Remove _mesa_memset in favor of plain memset.
This may break the SUNOS4 build, but it's no longer relevant.
diff --git a/src/mesa/shader/prog_cache.c b/src/mesa/shader/prog_cache.c
index 9437e59..8e54f3a 100644
--- a/src/mesa/shader/prog_cache.c
+++ b/src/mesa/shader/prog_cache.c
@@ -88,7 +88,7 @@
size = cache->size * 3;
items = (struct cache_item**) _mesa_malloc(size * sizeof(*items));
- _mesa_memset(items, 0, size * sizeof(*items));
+ memset(items, 0, size * sizeof(*items));
for (i = 0; i < cache->size; i++)
for (c = cache->items[i]; c; c = next) {