The comment provided by git starts lines with '# ' (space or tab),
so warn if a line starts with # not followed by a space. It's most
likely something like '#ifdef UNX' or AOO's '#i103131#'. We already
have commits where git silently stripped off such lines.
Change-Id: Ic366d8ee64207edb8bb2fb1ef3a6a192f55872d8
