linux.Stat -> linux.Statx

This provides access to os.Stat.creation_time for Linux.
Added a cast to string_interner.cpp for 32-bit compiles.

src/string_interner.cpp

@@ -81,7 +81,7 @@ gb_internal String string_interner_load(InternedString interned) {
 	u8 *base = cast(u8 *)interner + interned.value;
 	u32 str_len = *cast(u32 *)base;
 	u8 *text = base + 4;
-	String str = { text, str_len };
+	String str = { text, cast(isize)str_len };
 	return str;
 }
 
@@ -228,4 +228,4 @@ gb_internal void *string_interner_thread_local_arena_alloc(StringInternerThreadL
 	u8 *return_head = tl_arena->data + new_head;
 	tl_arena->cursor = cursor;
 	return return_head;
-}
+}