Add a changelog entry.

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+New: The cmake configuration system now allows enabling
+interprocedural and link-time optimization by the compiler. These
+kinds of optimization often result in substantially faster executables
+because they allow the compiler to see a bigger part of the whole
+program when optimizing.
+
+To enable interprocedural and link-time optimization, pass the
+`-DDEAL_II_USE_LTO=ON` flag to cmake when configuring the library.
+<br>
+(Wolfgang Bangerth, 2024/09/24)