Rename MG_ARCH_NEWLIB -> MG_ARCH_ARM_GCC

tutorials/http/device-dashboard/microchip/same54-xpro/Makefile

@@ -10,7 +10,7 @@ SOURCES = main.c syscalls.c startup.c
 
 # Mongoose-specific source code files and build options. See https://mongoose.ws/documentation/#build-options
 SOURCES += mongoose.c net.c packed_fs.c
-CFLAGS += -DMG_ENABLE_TCPIP=1 -DMG_ARCH=MG_ARCH_NEWLIB -DMG_ENABLE_CUSTOM_MILLIS=1 -DMG_ENABLE_LINES=1
+CFLAGS += -DMG_ENABLE_TCPIP=1 -DMG_ARCH=MG_ARCH_ARMGCC -DMG_ENABLE_CUSTOM_MILLIS=1 -DMG_ENABLE_LINES=1
 CFLAGS += -DMG_ENABLE_DRIVER_SAME54=1 -DMG_ENABLE_CUSTOM_RANDOM=1 -DMG_ENABLE_PACKED_FS=1 $(CFLAGS_EXTRA)
 
 # Example specific build options. See README.md

tutorials/http/http-server/arduino/teensy41-http/mongoose_config.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#define MG_ARCH MG_ARCH_NEWLIB     // Use ARM toolchain
+#define MG_ARCH MG_ARCH_ARMGCC     // Use ARM toolchain
 #define MG_ENABLE_TCPIP 1          // Enable built-in network stack
 #define MG_ENABLE_DRIVER_IMXRT10 1   // Enable RTxx driver
 #define MG_ENABLE_CUSTOM_MILLIS 1  // Let user implement mg_millis()