editor.c: Libify launch_editor()
This patch removes exit()/die() calls and builtin-specific messages from launch_editor(), so that it can be used as a general libgit.a function to launch an editor. Signed-off-by: NStephan Beyer <s-beyer@gmx.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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