Removed unnecessary include.
Some OSes, as Linux, provide FIONBIO in <sys/ioctl.h>.  Others,
such as the BSDs and Illumos, provide it in <sys/filio.h>, but
they all include that header from <sys/ioctl.h>, so for this test,
we can simplify and just include <sys/ioctl.h>.
@@ -225,12 +225,6 @@ nxt_feature_test="#include <sys/filio.h>
}"
. auto/feature
-if [ $nxt_found = yes ]; then
- NXT_SYS_FILIO_H="#include <sys/filio.h>"
-else
- NXT_SYS_FILIO_H=
-fi
-
nxt_feature="ioctl(FIONBIO)"
nxt_feature_name=NXT_HAVE_FIONBIO
@@ -239,7 +233,6 @@ nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="#include <unistd.h>
#include <sys/socket.h>
- $NXT_SYS_FILIO_H
#include <sys/ioctl.h>
int main() {
