nuttx: Add LIBSUPCXX_TOOLCHAIN to link the prebuilt library provide by toolchain.

Signed-off-by: cuiziwei <cuiziwei@xiaomi.com>

libs/libc/machine/arm/CMakeLists.txt

@@ -46,7 +46,7 @@ elseif(CONFIG_ARCH_ARMV8M) # All ARMv8-M
   add_subdirectory(armv8-m)
 endif()
 
-if(NOT CONFIG_LIBSUPCXX)
+if(NOT CONFIG_LIBSUPCXX_TOOLCHAIN)
   list(APPEND SRCS aeabi_atexit.c)
 endif()
 

libs/libc/machine/arm/Make.defs

@@ -44,7 +44,7 @@ else ifeq ($(CONFIG_ARCH_ARMV8M),y)     # All ARMv8-M
 include $(TOPDIR)/libs/libc/machine/arm/armv8-m/Make.defs
 endif
 
-ifneq ($(CONFIG_LIBSUPCXX),y)
+ifneq ($(CONFIG_LIBSUPCXX_TOOLCHAIN),y)
 CSRCS += aeabi_atexit.c
 endif