configure: Work around bug in autoconf 2.64
In autoconf 2.64, if AC_CHECK_LIB is first used in a conditional that
evaluates to false, the helper function ac_fn_c_try_link gets defined
inside that conditional, and then subsequent attempts to use
ac_fn_c_try_link() will blow up. Work around this by moving an
unconditional use of AC_CHECK_LIB to the beginning of configure.in.
Signed-off-by:
"Theodore Ts'o" <tytso@mit.edu>
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