Add NEWS entry

Author: pablogsal

Misc/NEWS.d/next/Build/2025-03-26-23-34-17.gh-issue-115028.-jEZA-.rst

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+Add a new ``--with-relative-rpath`` configure option that sets $ORIGIN-based
+RPATHs for Python binaries when enabled. This is a first step towards making
+Python installations more relocatable on Linux by allowing shared libraries
+to be found relative to their binary locations. Currently Linux-only.