[master] Replace FNR with NR in the awk script used by nextpart()

awk on Solaris does not support the FNR variable.  As nextpart() only
reads from one file, replace FNR with NR.

bin/tests/system/conf.sh.in

@@ -195,8 +195,8 @@ fi
 nextpart () {
     [ -f $1.prev ] || echo "0" > $1.prev
     prev=`cat $1.prev`
-    awk "FNR > $prev "'{ print }
-         END           { print NR > "/dev/stderr" }' $1 2> $1.prev
+    awk "NR > $prev "'{ print }
+         END          { print NR > "/dev/stderr" }' $1 2> $1.prev
 }
 
 #

bin/tests/system/conf.sh.win32

@@ -185,8 +185,8 @@ echoinfo () {
 nextpart () {
     [ -f $1.prev ] || echo "0" > $1.prev
     prev=`cat $1.prev`
-    awk "FNR > $prev "'{ print }
-         END           { print NR > "/dev/stderr" }' $1 2> $1.prev
+    awk "NR > $prev "'{ print }
+         END          { print NR > "/dev/stderr" }' $1 2> $1.prev
 }
 
 #