This test tried to be lazy and test both getmntent() and getmntent_r()
in the same test, but that led to an implicit assumption that /proc
isn't the first mount returned.
This new version is quite a bit more thorough than the old. It does
assume that the mount list doesn't change while the test is running, but
that seems like a reasonable assumption to make during CTS?
Bug: https://issuetracker.google.com/230228681
Test: treehugger
Change-Id: I5c5f0b86ae1c4df9a2ce69d48e1c3accb42c687b
bionic has the Linux-specific mntent.h but is missing hasmntopt().
Change-Id: I0ab7b83626c969704add4e64b37a6fc715d4a723
Signed-off-by: Greg Hackmann <ghackmann@google.com>
