Remove a needless changefile. (Needless because bug not released.)

changes/ticket24861

@@ -1,5 +0,0 @@
-  o Minor bugfix (zu format specifier on minGW):
-    - Fix minGW compatibility issue. Define TOR_PRIuSZ as minGW compiler
-      doesn't support zu format specifier for size_t type. Fixes bug 24861;
-      bugfix on ac9eebd6363.
-      Patch by "ffmancera".