strace: Change implementation to use ptrace()

Author: https://github.com/itamar8910
Commit: e5ebdb9bca
Pull-request: https://github.com/SerenityOS/serenity/pull/1517
Reviewed-by: https://github.com/awesomekling

Libraries/LibC/unistd.cpp

@@ -45,12 +45,6 @@
 
 extern "C" {
 
-int systrace(pid_t pid)
-{
-    int rc = syscall(SC_systrace, pid);
-    __RETURN_WITH_ERRNO(rc, rc, -1);
-}
-
 int chown(const char* pathname, uid_t uid, gid_t gid)
 {
     if (!pathname) {