fstests: autoconf has deprecated a bunch of macros

fstests: autoconf has deprecated a bunch of macros

Latest debian unstable environment results in these build warnings:

autoconf
configure.ac:8: warning: The macro `AC_HEADER_STDC' is obsolete.
configure.ac:8: You should run autoupdate.
./lib/autoconf/headers.m4:704: AC_HEADER_STDC is expanded from...
configure.ac:8: the top level
configure.ac:50: warning: The macro `AC_TRY_LINK' is obsolete.
configure.ac:50: You should run autoupdate.
./lib/autoconf/general.m4:2920: AC_TRY_LINK is expanded from...
m4/package_xfslibs.m4:95: AC_PACKAGE_NEED_XFSCTL_MACRO is expanded from...
configure.ac:50: the top level
configure.ac:63: warning: The macro `AC_TRY_LINK' is obsolete.
configure.ac:63: You should run autoupdate.
./lib/autoconf/general.m4:2920: AC_TRY_LINK is expanded from...
acinclude.m4:19: AC_PACKAGE_WANT_FALLOCATE is expanded from...
configure.ac:63: the top level
configure.ac:64: warning: The macro `AC_TRY_LINK' is obsolete.
configure.ac:64: You should run autoupdate.
./lib/autoconf/general.m4:2920: AC_TRY_LINK is expanded from...
acinclude.m4:32: AC_PACKAGE_WANT_OPEN_BY_HANDLE_AT is expanded from...
configure.ac:64: the top level
configure.ac:69: warning: The macro `AC_TRY_LINK' is obsolete.
configure.ac:69: You should run autoupdate.
./lib/autoconf/general.m4:2920: AC_TRY_LINK is expanded from...
m4/package_libcdev.m4:106: AC_HAVE_COPY_FILE_RANGE is expanded from...
configure.ac:69: the top level
configure.ac:107: warning: The macro `AC_CONFIG_HEADER' is obsolete.
configure.ac:107: You should run autoupdate.
./lib/autoconf/status.m4:719: AC_CONFIG_HEADER is expanded from...
configure.ac:107: the top level

So, run autoupdate and then fix all the warnings.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>