598 – missing reentrant Linux functions

std.c.linux.socket:
int gethostbyname_r(char* name, hostent* ret, void* buf, size_t buflen, hostent** result, int* h_errnop);
int gethostbyname2_r(char* name, int af, hostent* ret, void* buf, size_t buflen, hostent** result, int* h_errnop);
std.c.linux.linux:
char* asctime_r(tm* t, char* buf);
char* ctime_r(__time_t* timep, char* buf);
tm* gmtime_r(__time_t* timep, tm* result);
tm* localtime_r(__time_t* timep, tm* result);

Added in DMD 0.176.