[File] [PATCH] Magdir/make: combine regex into single multi branch regex

[Dirk Müller]

Hi,

There's probably something that I'm missing here, as I'm not deeply
familiar with file(1). During
benchmarking I found that matching for make always shows up in the profiles.

As far as I can see we can combine multiple regexes into a single one
using branches, which is a lot faster and reduces the total number of
rules, lowering the memory footprint
a bit. In combination with the regex-compilation caching this improves
matching over the linux kernel tree by over 30%.

Why was this done the previous way?

Thanks,
Dirk
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