dev-cpp/tree: remove unused patch

Closes: https://github.com/gentoo/gentoo/pull/8836

dev-cpp/tree/files/tree-2.65-gcc46.patch

@@ -1,15 +0,0 @@
- tree.hh |    1 +
- 1 files changed, 1 insertions(+), 0 deletions(-)
-
-diff --git a/tree.hh b/tree.hh
-index 1429da3..d780be3 100644
---- a/tree.hh
-+++ b/tree.hh
-@@ -71,6 +71,7 @@
- #include <set>
- #include <queue>
- #include <algorithm>
-+#include <cstddef>
- 
- // HP-style construct/destroy have gone from the standard,
- // so here is a copy.