A few other GMP improvements (Was: use of ALLOC(), SIZE(), PTR() macros in libgmp)

[Jan Nijtmans]

A few more minor improvements. A patch file "diff.txt" is appended to this mail.

- dumbmp.c already includes <stdio.h> and <stdlib.h>, so any file including
  dumbmp.c (gen-psqr.c, gan-fac_ui.c, gen-fib.c) does not need to include those
  header files again.
- In gmp-impl.h, there is the line:
        #if ! __GMP_WITHIN_CONFIGURE
  But in all other places (gmp.h, mp.h) the following line is used:
        #if ! defined (__GMP_WITHIN_CONFIGURE)
  Most preprocessors consider a non-existing macro as false, but this
  is not standard, so gmp-impl.h is not correct (although gcc accepts it).
- In mpn/generic/addsub_n.c, the stack variables acyn resp ssyn can
  be eliminated if HAVE_NATIVE_mpn_add_nc resp HAVE_NATIVE_mpn_sub_nc
  are defined. (This eliminates a warning when using gcc -Wall).
- In mpz/get_str.c, mpz/out_str.c and demos/pexpr.c, char pointers are
initialized
  with const char pointers. gcc doesn't warn for that by default, but if
  -Wwrite-strings is specified gcc does warn about it.

Regards,
         Jan Nijtmans
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