Building gmp with -fvisibility=hidden

[Yuri Gribov]

Hi all,

Is there any interest in building GMP with -fvisility=hidden on Linux?
I gave it a try recently but it only removed few symbols:
  __gmp_asprintf_funs
  __gmp_fac2cnt_table
  __gmp_fprintf_funs
  __gmp_fscanf_funs
  __gmp_limbroots_table
  __gmp_mt_recalc_buffer
  __gmpn_divexact_by3
  __gmpn_divmod_1
  __gmpn_gcdext_hook
  __gmp_obstack_printf_funs
  __gmp_odd2fac_table
  __gmp_oddfac_table
  __gmp_randclear_mt
  __gmp_randget_mt
  __gmp_randiset_mt
  __gmp_snprintf_funs
  __gmp_sprintf_funs
  __gmp_sscanf_funs
  __gmpz_legendre
.text size didn't change which means that hiding those didn't allow
for any new optimizations. Dynamic linker sections (.plt, .got,
.rela.dyn, etc.) decreased so maybe applications startup will be
slightly faster.

I attached draft patch (passes `make check').

Best regards,
Yury Gribov
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