* fixed initialisation of fpscr register to avoid spurious SIGPFE's
(uses mtfsb0 instruction, so added extra define in options.pas to avoid
requiring to start with a cross compiler)
Can't just put an assembler file here, because it's composed of 2
assembler files and a C file. No idea whether it will actually
work on OS X 10.1.x (may require 10.2.x, since it's from the main
branch)