macho/sym: Record initial symbol number always
macho/sym: Record initial symbol number always

The special segment may need this information for future fix-ups.

Based-on-code-from: zenith432 <34af7ae747ebe653036517897481b0763d276599@users.sourceforge.net>
Signed-off-by: Chang S. Bae <5225702d5f350302bceb6664e109365ef85e2e11@gmail.com>

techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm