[syslinux] rosh patch V2

[Keith Schincke]

Here is a second version of my patch from last night.

It uses the provided ctype function isspace and does the same readdir().
I remove the rosh_issp() function. I admit to being a bit liberal with my
use of braces and spaces.

We all of the habit of knowing we can invent a more perfect wheel.

Let me know if you have any questions.

Keith
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