ident: add NO_GECOS_IN_PWENT for systems without pw_gecos in struct passwd
Allow NO_GECOS_IN_PWENT to be defined in the Makefile for platforms that lack the pw_gecos field in their "struct passwd", in which case the uppercased user name is used instead via the standard '&' replacement mechanism. Signed-off-by: NRafael Gieschke <rafael@gieschke.de> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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