On AIX, stat will store inodes in 32bit even when using LARGE_FILES.
If the inode is larger, it will return -1 in st_ino.
Thus, in incpath.c when comparing include directories, if several
of them have 64bit inodes, they will be considered as duplicated.

gcc/ChangeLog:
2022-01-12  Clément Chigot  <clement.chigot@atos.net>

	* configure.ac: Check sizeof ino_t and dev_t.
	(HOST_STAT_FOR_64BIT_INODES): New AC_DEFINE to provide stat
	syscall being able to handle 64bit inodes.
	* config.in: Regenerate.
	* configure: Regenerate.
	* incpath.c (HOST_STAT_FOR_64BIT_INODES): New define.
	(remove_duplicates): Use it.

libcpp/ChangeLog:
2022-01-12  Clément Chigot  <clement.chigot@atos.net>

	* configure.ac: Check sizeof ino_t and dev_t.
	* config.in: Regenerate.
	* configure: Regenerate.
	* include/cpplib.h (INO_T_CPP): Change for AIX.
	(DEV_T_CPP): New macro.
	(struct cpp_dir): Use it.