fix build standalone

platformio.ini

@@ -166,9 +166,7 @@ build_unflags = ${common.unbuild_flags}
 board_upload.use_1200bps_touch = false
 board_upload.wait_for_upload_port = false
 
-; see https://docs.platformio.org/en/latest/platforms/native.html#id1
-; to build: pio run -e standalone
-; to run and build: pio run -e standalone -t exec
+; to build and run: pio run -e standalone -t exec
 [env:standalone]
 platform = native
 build_flags =
@@ -177,7 +175,7 @@ build_flags =
   -DEMSESP_DEBUG -DEMSESP_STANDALONE -DEMSESP_TEST
   -DEMSESP_DEFAULT_LOCALE=\"en\" -DEMSESP_DEFAULT_TX_MODE=8 -DEMSESP_DEFAULT_VERSION=\"3.6.0-dev\" -DEMSESP_DEFAULT_BOARD_PROFILE=\"S32\"
 	-lpthread
-  -std=gnu++17 -Og -ggdb
+  -std=gnu++11 -Og -ggdb
 build_src_flags = 
   -Wall -Wextra -Werror -Wswitch-enum -Wno-unused-parameter -Wno-inconsistent-missing-override -Wno-unused-lambda-capture
   -I./lib_standalone