[Bug-gnulib] addition: gcd.h, gcd.c

[Bruno Haible]

Hi,

I've added to the lib this function:

  /* Return the greatest common divisor of a > 0 and b > 0.  */
  extern unsigned int gcd PARAMS ((unsigned int a, unsigned int b));

because I've needed this in gettext in two places:
a. inside some hash table code,
b. when comparing two circular lists of different size.

After all, gcd is the fifth elementary operation after + - * /.

This function operates on small integers; bignums belong into other
packages, like bc, gmp, CLN, NTL etc.

Bruno