Support gcc FORTIFY_SOURCE features for nuttx libc

This function will use gcc's function
__builtin_dynamic_object_size and __builtin_object_size

Its function is to obtain the size of the object through compilation,
so as to judge whether there are out-of-bounds operations in commonly used functions.
It should be noted that the option -O2 and above is required to enable this function

Signed-off-by: anjiahao <1090959677@qq.com>

Kconfig

@@ -597,6 +597,18 @@ endmenu # Customize Header Files
 
 menu "Debug Options"
 
+config FORTIFY_SOURCE
+	int "Fortify Source"
+	default 0
+	range 0 3
+	---help---
+		Detect overflows of buffers in common string and memory functions
+		where the compiler can determine and validate the buffer sizes.
+		0 does not have any checks.
+		1 will only check for out-of-bounds at compile time.
+		2 will only perform out-of-bounds checks on stack variables.
+		3 On the basis of 2, add an out-of-bounds check for dynamically allocated variables.
+
 config NDEBUG
 	bool "Define NDEBUG globally"
 	default !DEBUG_ASSERTIONS