protect some limit constants with feature test macros on x86_64

[musl] / arch / x86_64 / bits / stdio.h

#define BUFSIZ 1024

#define FILENAME_MAX 4095
#define FOPEN_MAX 1000
#define TMP_MAX 10000

#define L_cuserid 20
#define L_ctermid 20
#define L_tmpnam 20
#define P_tmpdir "/tmp"