added copyright headers

tools/c2e/c2e_driver.cpp

tools/c2e/c2e_instr.cpp

tools/c2e/c2e_instr.hpp

tools/cgc_hlx/cgc_hlx.cpp

tools/cgc_hlx/cgc_hlx_driver.cpp

tools/cgc_rigrandom/rigrandom_driver.cpp

tools/cgc_rigrandom/rigrandom_instr.cpp

tools/cgc_rigrandom/rigrandom_instr.hpp

tools/cgclibc/cgclibc.cpp

tools/cgclibc/cgclibc.hpp

tools/cinderella/cinderella_prep.cpp

tools/cinderella/cinderella_prep.hpp

tools/fix_rets/fix_rets.cpp

tools/fix_rets/fix_rets.hpp

tools/fix_rets/fix_rets_driver.cpp

tools/inferfn/inferfn.cpp

tools/inferfn/inferfn.hpp

tools/prince/prince.cpp

tools/prince/prince_driver.cpp

tools/selective_cfi/scfi_driver.cpp