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9a4495f8 - Drop our xalloc_oversized macro in favour of gnulib's xalloc_oversized macro.

Drop our xalloc_oversized macro in favour of gnulib's xalloc_oversized macro. * gnulib-local/lib/xalloc.h: Include xalloc-oversized.h. (xalloc_oversized): Remove macro. * gnulib-local/modules/xalloc (Depends-on): Add 'xalloc-oversized'.