posix: Use picolibc's limits.h when building POSIX code

When building POSIX code, we need to use picolibc's limits.h instead of
manually defining the POSIX values. This avoids duplicate definitions of
these symbols.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

include/zephyr/posix/posix_features.h

@@ -245,6 +245,13 @@
 /* #define _XOPEN_UNIX (-1L) */
 /* #define _XOPEN_UUCP (-1L) */
 
+#if _POSIX_C_SOURCE >= 200809L && (__PICOLIBC__ > 1 ||			\
+(__PICOLIBC__ == 1 && (__PICOLIBC_MINOR__ > 8 ||			\
+__PICOLIBC_MINOR__ == 8 && __PICOLIBC_PATCHLEVEL__ >= 9)))
+/* Use picolibc's limits.h when building POSIX code */
+#include <limits.h>
+#else
+
 /* Maximum values */
 #define _POSIX_CLOCKRES_MIN (20000000L)
 
@@ -307,6 +314,8 @@
 #define _XOPEN_NAME_MAX                     (255)
 #define _XOPEN_PATH_MAX                     (1024)
 
+#endif /* __PICOLIBC__ */
+
 /* Other invariant values */
 #define NL_LANGMAX (14)
 #define NL_MSGMAX  (32767)