update essence platform

core/runtime/procs_essence.odin

@@ -0,0 +1,18 @@
+package runtime
+
+import "core:sys/es"
+
+@(link_name="memset")
+memset :: proc "c" (ptr: rawptr, val: i32, len: int) -> rawptr {
+	return es.CRTmemset(ptr, val, len);
+}
+
+@(link_name="memmove")
+memmove :: proc "c" (dst, src: rawptr, len: int) -> rawptr {
+	return es.CRTmemmove(dst, src, len);
+}
+
+@(link_name="memcpy")
+memcpy :: proc "c" (dst, src: rawptr, len: int) -> rawptr {
+	return es.CRTmemcpy(dst, src, len);
+}