[U-Boot-Users] patch to common.h

[Josh Fryman]

here's a small patch that permits stringification in an ISO C portable
way.  eg, you can have

  #define FOO	xyzabc

and someplace else call

  Xstr(FOO)

which will literally be replaced with

  "xyzabc"

this was very useful in a couple of key places in some other patches
and new-platform support.

-josh

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