automake: Check for 'indent' and fall back to 'cat' if not found.
The glapi generator code uses indent to produce more readable code. However, we don't want to make GNU indent a hard build dependency; check for it in configure.ac and fall back to 'cat' if it's not available. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=50484Signed-off-by: Kenneth Graunke <email@example.com> Reviewed-by: Matt Turner <firstname.lastname@example.org> Acked-by: Ben Widawsky <email@example.com>
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