i386: Update sgotplt_jump_table_size setting

i386: Update sgotplt_jump_table_size setting

elf_i386_size_dynamic_sections has

      htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
      htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;

This patch changes it to

      htab->sgotplt_jump_table_size
	= elf_x86_compute_jump_table_size (htab)

Since elf_x86_compute_jump_table_size is defined as

  ((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size)

there is no change in output.  It makes elf_i386_size_dynamic_sections
the same as elf_x86_64_size_dynamic_sections.

	* elf32-i386.c (elf_i386_size_dynamic_sections): Set
	sgotplt_jump_table_size with elf_x86_compute_jump_table_size.