nasm.c: clean up the handing of response files
nasm.c: clean up the handing of response files

Avoid using malloc/free (not nasm_malloc/nasm_free even) in the
processing of response files; move to separate function.

turingstudio/nasm,techkey/nasm,Distrotech/nasm,projedi/nasm,projedi/nasm,Distrotech/nasm,techkey/nasm,turingstudio/nasm,letolabs/nasm,projedi/nasm,projedi/nasm,Distrotech/nasm,Distrotech/nasm,techkey/nasm,turingstudio/nasm,techkey/nasm,letolabs/nasm,projedi/nasm,letolabs/nasm,techkey/nasm,turingstudio/nasm