Made C library able to access new math library.
UNIX compile defaults to using new math library.
Changed name of new math library to math.library.c
Added defines for new math library.
Renamed new soft floating point library to softfloat_library.c
git-svn-id: http://picoc.googlecode.com/svn/trunk@304 21eae674-98b7-11dd-bd71-f92a316d2d60