bpf_sim: use fopen()/fread()/fclose()
bpf_sim: use fopen()/fread()/fclose()

Also do some minor cleanup and typo correction while we are here.

Signed-off-by: Paul Moore <88a1d58bf22a647dce58dd91f9595600dceabba9@redhat.com>

amluto/libseccomp,seccomp/libseccomp,seccomp/libseccomp,amluto/libseccomp,amluto/libseccomp,seccomp/libseccomp