Enable checks for pointer arithmetic

Quite a few places we've disobeyed this rule, so simply ignore them for
now to avoid new issues popping up.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I3e518a8e8742279afb3ad1a9dad54006ed109fb1
diff --git a/include/pam_authenticate.hpp b/include/pam_authenticate.hpp
index 0ce0bb4..1459ea6 100644
--- a/include/pam_authenticate.hpp
+++ b/include/pam_authenticate.hpp
@@ -24,6 +24,7 @@
     for (int i = 0; i < numMsg; ++i)
     {
         /* Ignore all PAM messages except prompting for hidden input */
+        // NOLINTNEXTLINE(cppcoreguidelines-pro-bounds-pointer-arithmetic)
         if (msg[i]->msg_style != PAM_PROMPT_ECHO_OFF)
         {
             continue;
@@ -66,6 +67,7 @@
         // NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
         *resp = reinterpret_cast<pam_response*>(ptr);
 
+        // NOLINTNEXTLINE(cppcoreguidelines-pro-bounds-pointer-arithmetic)
         resp[i]->resp = pass;
 
         return PAM_SUCCESS;