lib: fix compile error

lib/errno.h: defined(__ARMCC_VERSION) for use GCC compile
lib/autmoic:fix compiler error:
nuttx/include/metal/compiler/gcc/atomic.h:19:13: error: conflicting type
qualifiers for 'atomic_flag'
19 | typedef int atomic_flag;
| ^~~~~~~~~~~
In file included from nuttx/include/nuttx/net/netdev_lowerhalf.h:38,
from virtio/virtio-net.c:33:
prebuilts/gcc/linux/arm/lib/gcc/arm-none-eabi/13.2.1/include/
stdatomic.h:233:3: note: previous declaration of 'atomic_flag' with
type 'atomic_flag'
233 | } atomic_flag;
| ^~~~~~~~~~~
nuttx/include/metal/compiler/gcc/atomic.h:20:14: error: conflicting
type qualifiers for 'atomic_char'
20 | typedef char atomic_char;
^~~~~~~~~~~

Signed-off-by: Yongrong Wang <wangyongrong@xiaomi.com>

lib/atomic.h

@@ -100,8 +100,8 @@ using std::atomic_fetch_and_explicit;
 using std::atomic_thread_fence;
 using std::atomic_signal_fence;
 
-#elif defined(HAVE_STDATOMIC_H) && !defined(__CC_ARM) && !defined(__arm__) && \
-      !defined(__STDC_NO_ATOMICS__)
+#elif defined(HAVE_STDATOMIC_H) && !defined(__ARMCC_VERSION) && \
+!defined(__STDC_NO_ATOMICS__)
 # include <stdint.h>
 # include <stdatomic.h>
 #elif defined(__GNUC__)

lib/errno.h

@@ -14,7 +14,7 @@
 
 #if defined(__ICCARM__)
 # include <metal/compiler/iar/errno.h>
-#elif defined(__CC_ARM) || defined(__arm__)
+#elif defined(__ARMCC_VERSION)
 # include <metal/compiler/armcc/errno.h>
 #else
 # include <errno.h>