whitespace and grammar fixes for mini-gmp.c

[Paul Eggert]

When merging GNU MP 6.2.0 mini-gmp.c into GNU Emacs (which uses mini-gmp 
on platforms lacking libgmp), I noticed three trivial fixes that had 
been applied on the Emacs copy that would be useful to propagate 
upstream to GNU MP. The first is trailing whitespace on a source code 
line (which the Emacs version-control system warns about). The other two 
are duplicated words "the the" and "to to", respectively. Please see the 
attached patch.
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