Made CFLAGS depend on empty var
Made CFLAGS depend on empty var

Psykar/kubos,satlab/libcsp,satlab/libcsp,pacheco017/libcsp,Psykar/kubos,kubostech/KubOS,Psykar/kubos,GomSpace/libcsp,libcsp/libcsp,pacheco017/libcsp,Psykar/kubos,kubostech/KubOS,Psykar/kubos,libcsp/libcsp,satlab/libcsp,pacheco017/libcsp,GomSpace/libcsp,Psykar/kubos,pacheco017/libcsp,Psykar/kubos,GomSpace/libcsp