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The debugging environment variables EXT2FS_PRETEND_* were implemented
in check_mntent_file(), and this function isn't called on all
operating systems.  Lift this code up to ext2fs_check_mount_point(),
so that these environment variables (which are used in the regression
test suite) will work on all platforms.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>