[PATCHV2] libgcrypt: fix building error with '-O2' in sysroot path

[Werner Koch]

Hi!

I applied your patch to master and 1.10.  Note that there is also a
--disable-O-flag-munging configure option which could have been used.
But your patch makes it easier and the configure option can then be used
on legacy systems to solve problems with the POSIX sed r.e.

Thanks,

  Werner
  
-- 
The pioneers of a warless world are the youth that
refuse military service.             - A. Einstein
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