preallocate memory in Init_OtherState for xdot because of bizarre memory issue that came up when compiling the FAST_Library for Simulink.
preallocate memory in Init_OtherState for xdot because of bizarre memory issue that came up when compiling the FAST_Library for Simulink.

git-svn-id: ff3ca786fa44f6d2d1a794b3b645b1652b118bb4@881 10acb478-4768-415a-8850-bacdb5912d4d

NWTC/FAST,NWTC/FAST