* lib/binary-io.h (set_binary_mode): New function.
(SET_BINARY): Define in terms of set_binary_mode.
* modules/binary-io (configure.ac): Require AC_C_INLINE.
* tests/test-binary-io.c (main): Accept an argument, and test either
set_binary_mode or SET_BINARY depending on the argument.
* tests/test-binary-io.sh: Invoke test-binary-io twice, with an
argument. Clean up also t-bin-out0.tmp.
* modules/binary-io (Depends-on): Add fcntl-h.
* lib/binary-io.h (O_TEXT): Rely on replacement <fcntl.h> rather
than blindly undefining O_TEXT.
Reported by Scott McCreary.
Signed-off-by: Eric Blake <eblake@redhat.com>
