Add all libf2c files

Utilities/otb6S/libf2c/Notice

Utilities/otb6S/libf2c/README

Utilities/otb6S/libf2c/arith.h

Utilities/otb6S/libf2c/backspac.c

Utilities/otb6S/libf2c/c_abs.c

Utilities/otb6S/libf2c/c_cos.c

Utilities/otb6S/libf2c/c_exp.c

Utilities/otb6S/libf2c/c_log.c

Utilities/otb6S/libf2c/c_sin.c

Utilities/otb6S/libf2c/cabs.c

Utilities/otb6S/libf2c/close.c

Utilities/otb6S/libf2c/comptry.bat

Utilities/otb6S/libf2c/d_abs.c

Utilities/otb6S/libf2c/d_acos.c

Utilities/otb6S/libf2c/d_asin.c

Utilities/otb6S/libf2c/d_atan.c

Utilities/otb6S/libf2c/d_atn2.c

Utilities/otb6S/libf2c/d_cnjg.c

Utilities/otb6S/libf2c/d_cos.c

Utilities/otb6S/libf2c/d_cosh.c