Removed ununsed libseccomp2 from ssp

- removed libseccomp2 dependency from lib/os/linux/utils/BUILD
- removed from dependencies.bzl
- deleted third_party/libseccomp2 directory

GIT_ORIGIN_SPP_REV_ID: 70aa402e31bd899a983e4910cae3c677907fbb72

Author: rahulthakre29

score/os/linux/utils/BUILD

@@ -27,7 +27,6 @@ cc_library(
         "@score_baselibs//score/os/linux/utils/test:__subpackages__",
     ],
     deps = [
-        "//third_party/libseccomp2",
         "@score_baselibs//score/language/futurecpp",
         "@score_baselibs//score/os:stat",
         "@score_baselibs//score/os/linux",