[3919] Suppress cppcheck warning for v4Opts

src/bin/perfdhcp/tests/perf_pkt4_unittest.cc

@@ -74,6 +74,7 @@ public:
             255, 255, 255, 255,     // giaddr
         };
 
+	// cppcheck-suppress variableScope
         uint8_t v4Opts[] = {
             DHO_HOST_NAME, 3, 0,   1,  2,  // Host name option.
             DHO_BOOT_SIZE, 3, 10, 11, 12,  // Boot file size option