posix: drop lstat() test

POSIX has required this since forever. Non-POSIX OS have their own
back-end already. (Incidentally, vlc_stat() is dead code.)

configure.ac

@@ -590,7 +590,7 @@ dnl Check for system libs needed
 need_libc=false
 
 dnl Check for usual libc functions
-AC_CHECK_FUNCS([accept4 daemon fcntl flock fstatvfs fork getenv getpwuid_r isatty lstat memalign mkostemp mmap open_memstream openat pipe2 pread posix_fadvise posix_madvise posix_memalign setlocale stricmp strnicmp strptime tdestroy uselocale])
+AC_CHECK_FUNCS([accept4 daemon fcntl flock fstatvfs fork getenv getpwuid_r isatty memalign mkostemp mmap open_memstream openat pipe2 pread posix_fadvise posix_madvise posix_memalign setlocale stricmp strnicmp strptime tdestroy uselocale])
 AC_REPLACE_FUNCS([aligned_alloc atof atoll dirfd fdopendir ffsll flockfile fsync getdelim getpid lldiv memrchr nrand48 poll recvmsg rewind sendmsg setenv strcasecmp strcasestr strdup strlcpy strndup strnlen strnstr strsep strtof strtok_r strtoll swab tfind timegm timespec_get strverscmp pathconf])
 AC_REPLACE_FUNCS([gettimeofday])
 AC_CHECK_FUNC(fdatasync,,

src/posix/filesystem.c

@@ -37,9 +37,6 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/stat.h>
-#ifndef HAVE_LSTAT
-# define lstat(a, b) stat(a, b)
-#endif
 #include <dirent.h>
 #include <sys/socket.h>