src/privsep-linux.c: add support for microblaze (#24)

 src/privsep-linux.c: add support for microblaze (#24)

Fix the following build failure:

privsep-linux.c:206:4: error: #error "Platform does not support seccomp filter yet"
 #  error "Platform does not support seccomp filter yet"
    ^~~~~
In file included from privsep-linux.c:36:
privsep-linux.c:213:38: error: 'SECCOMP_AUDIT_ARCH' undeclared here (not in a function); did you mean 'SECCOMP_ALLOW_ARG'?
  BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, SECCOMP_AUDIT_ARCH, 1, 0),
                                      ^~~~~~~~~~~~~~~~~~

It should be noted that AUDIT_ARCH_MICROBLAZE is only defined since
kernel 3.18 and
https://github.com/torvalds/linux/commit/ce5d112827e5c2e9864323d0efd7ec2a62c6dce0

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>