[bugfix][RHEL/7] Fix make warning for RHEL7 builds

- Fixes #318
[Enhancement] [RHEL/6] Add audit DAC remediations for chmod, fchmod & fchmodat system calls
[Enhancement] [RHEL/6] Add audit DAC remediations for chown group based system calls
                       (chown, fchown, lchown & fchownat)
[Enhancement] [RHEL/6] Add audit DAC remediations for xattr group based system calls
(setxattr, lsetxattr, fsetxattr, removexattr, lremovexattr, and fremovexattr)
Merge pull request #340 from iankko/audit_syscall_group_remediations

[Enhancement] [RHEL/6] Add audit syscall remediations for '*chown*, *chmod* & *xattr' groups
Merge pull request #325 from redhatrises/make_warning_rhel7

[bugfix][RHEL/7] Fix make warning for RHEL7 builds. See:
https://github.com/OpenSCAP/scap-security-guide/pull/325#issuecomment-64876450 for reasoning.
[Enhancement] [RHEL/6, RHEL/7] Add remediation for ensure_redhat_gpgkey_installed rule
[BugFix] [RHEL/6, RHEL/7] Fix OVAL check for ensure_redhat_gpgkey_installed rule
[BugFix] [RHEL/6] Fix audit_rules_time_stime OVAL check to return appropriate
result also on 64-bit architecture
Merge pull request #342 from iankko/rhel_ensure_redhat_gpgkey_installed_remediation

[BugFix] [Enhancement] [RHEL/6, RHEL/7] Fix OVAL check & add remediation for ensure_redhat_gpgkey_installed_rule
Merge pull request #344 from iankko/fix_audit_rules_time_stime_oval_check

[BugFix] [RHEL/6] Fix audit_rules_time_stime OVAL check to return appropriate result also on 64-bit architecture