os: use PrivsElevated instead of a manual check

Signed-off-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Ben Crocker <bcrocker@redhat.com>
Reviewed-by: Antoine Martin <antoine@nagafix.co.uk>
Tested-by: Ben Crocker <bcrocker@redhat.com>

os/utils.c

@@ -1863,7 +1863,7 @@ CheckUserParameters(int argc, char **argv, char **envp)
     char *a, *e = NULL;
 
 #if CHECK_EUID
-    if (geteuid() == 0 && getuid() != geteuid())
+    if (PrivsElevated())
 #endif
     {
         /* Check each argv[] */