Fuzzers whining about mach-o support

It's very easy to make bfd/mach-o.c allocate huge amounts of memory
with fuzzed binaries.  This make it a little harder.

The patch also fixes a number of places where an attempt to detect
overflow of multiplication was done with code like
  if (x * 4 < x)
    /* overflow case */
That of course doesn't work.  There are plenty of values of x that
overflow x * 4 but (x * 4) mod 2^n is greater than x.  For example
with 16-bit types, 0x6000 * 4 = 0x18000 mod 2^16 = 0x8000.

	* mach-o.c (bfd_mach_o_canonicalize_relocs): Fix ineffective
	overflow check.
	(bfd_mach_o_canonicalize_reloc): Likewise.
	(bfd_mach_o_canonicalize_dynamic_reloc): Likewise.  Sanity check
	counts and offsets against file size.
	(bfd_mach_o_build_dysymtab): Fix ineffective overflow check.
	(bfd_mach_o_mangle_sections): Remove unnecessary overflow check.
	(bfd_mach_o_read_symtab_symbols): Sanity check count and offset
	against file size.  Delete symbol table error message.
	(bfd_mach_o_read_dysymtab): Sanity check counts and offsets
	against file size.
	(bfd_mach_o_read_symtab): Likewise.
	(bfd_mach_o_read_command): Pass file size.
	(bfd_mach_o_scan): Sanity check command count against file size.

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