platformio.ini: suppress compiler warnings

platformio.ini

@@ -65,7 +65,7 @@ lib_deps_all =
 build_flags =
     -include "src/hal/${PIOENV}.h"
     -include "src/paxcounter.conf"
-    ;-w
+    -w
     ;'-D ARDUINO_LMIC_PROJECT_CONFIG_H="/$PROJECTSRC_DIR/lmic_config.h"'
     '-D ARDUINO_LMIC_PROJECT_CONFIG_H=../../../src/lmic_config.h'
     '-D CORE_DEBUG_LEVEL=${common.debug_level}'