Add AC_USE_SYSTEM_EXTENSIONS to expose non-standard extensions

Required on Solaris to expose definitions in system headers that
are not defined in the XPG standards now that xtrans 1.3 defines
_XOPEN_SOURCE to 600 on Solaris.

Fixes build failures:
fserve.c: In function 'fs_block_handler':
fserve.c:1210:5: error: 'fd_mask' undeclared (first use in this function)
fserve.c:1210:5: note: each undeclared identifier is reported only once for each function it appears in
In file included from transport.c:67:0,
                 from fstrans.c:28:
Xtranssock.c: In function '_FontTransSocketINETConnect':
Xtranssock.c:1421:19: error: 'INET6_ADDRSTRLEN' undeclared (first use in this function)
Xtranssock.c:1421:19: note: each undeclared identifier is reported only once for each function it appears in

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>

0 files changed, 0 insertions, 0 deletions