bluray: check for getmntent_r symbol

getmntent_r is not necessarily available when the mntent.h header is present
(cf.  Android).

configure.ac

@@ -639,7 +639,7 @@ dnl Check for system libs needed
 need_libc=false
 
 dnl Check for usual libc functions
-AC_CHECK_FUNCS([accept4 daemon fcntl flock fstatat fstatvfs fork getenv getpwuid_r isatty memalign mkostemp mmap open_memstream newlocale pipe2 pread posix_fadvise posix_madvise setlocale stricmp strnicmp strptime uselocale])
+AC_CHECK_FUNCS([accept4 daemon fcntl flock fstatat fstatvfs fork getmntent_r getenv getpwuid_r isatty memalign mkostemp mmap open_memstream newlocale pipe2 pread posix_fadvise posix_madvise setlocale stricmp strnicmp strptime uselocale])
 AC_REPLACE_FUNCS([aligned_alloc atof atoll dirfd fdopendir flockfile fsync getdelim getpid lfind lldiv memrchr nrand48 poll posix_memalign recvmsg rewind sendmsg setenv strcasecmp strcasestr strdup strlcpy strndup strnlen strnstr strsep strtof strtok_r strtoll swab tdestroy tfind timegm timespec_get strverscmp pathconf])
 AC_REPLACE_FUNCS([gettimeofday])
 AC_CHECK_FUNC(fdatasync,,
@@ -900,7 +900,7 @@ dnl  BSD
 AC_CHECK_HEADERS([netinet/tcp.h netinet/udplite.h sys/param.h sys/mount.h])
 
 dnl  GNU/Linux
-AC_CHECK_HEADERS([features.h getopt.h linux/dccp.h linux/magic.h mntent.h sys/eventfd.h])
+AC_CHECK_HEADERS([features.h getopt.h linux/dccp.h linux/magic.h sys/eventfd.h])
 
 dnl  MacOS
 AC_CHECK_HEADERS([xlocale.h])

modules/access/bluray.c

@@ -28,7 +28,7 @@
 #include <assert.h>
 #include <stdatomic.h>
 
-#if defined (HAVE_MNTENT_H) && defined(HAVE_SYS_STAT_H)
+#ifdef HAVE_GETMNTENT_R
 # include <mntent.h>
 #endif
 #include <fcntl.h>      /* O_* */
@@ -545,7 +545,7 @@ static void  notifyDiscontinuityToParser( demux_sys_t *p_sys );
 static void FindMountPoint(char **file)
 {
     char *device = *file;
-#if defined (HAVE_MNTENT_H) && defined (HAVE_SYS_STAT_H)
+#ifdef HAVE_GETMNTENT_R
     /* bd path may be a symlink (e.g. /dev/dvd -> /dev/sr0), so make sure
      * we look up the real device */
     char *bd_device = realpath(device, NULL);