git-am: fixed patch_format detection according to RFC2822
RFC2822 specifies in paragraph 3.6.8, that optional header fields are made up of any printable US-ASCII character except ' ' (space) and ':' (colon). The pattern for the egrep command is changed to match all of these characters. Signed-off-by: NChristian Himpel <chressie@gmail.com> Signed-off-by: NShawn O. Pearce <spearce@spearce.org>
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