Move portable specific settings down.

This brings the top hunk of the file back in sync with OpenBSD
so patches to the CVS Id should apply instead of always being
rejected.

regress/test-exec.sh

@@ -3,30 +3,6 @@
 
 #SUDO=sudo
 
-# Unbreak GNU head(1)
-_POSIX2_VERSION=199209
-export _POSIX2_VERSION
-
-case `uname -s 2>/dev/null` in
-OSF1*)
-	BIN_SH=xpg4
-	export BIN_SH
-	;;
-CYGWIN*)
-	os=cygwin
-	;;
-esac
-
-# If configure tells us to use a different egrep, create a wrapper function
-# to call it.  This means we don't need to change all the tests that depend
-# on a good implementation.
-if test "x${EGREP}" != "x"; then
-	egrep ()
-{
-	 ${EGREP} "$@"
-}
-fi
-
 if [ ! -x "$TEST_SSH_ELAPSED_TIMES" ]; then
 	STARTTIME=`date '+%s'`
 fi
@@ -63,6 +39,8 @@ else
 fi
 unset SSH_AUTH_SOCK
 
+# Portable-specific settings.
+
 if [ -x /usr/ucb/whoami ]; then
 	USER=`/usr/ucb/whoami`
 elif whoami >/dev/null 2>&1; then
@@ -77,6 +55,30 @@ if test -z "$LOGNAME"; then
 	export LOGNAME
 fi
 
+# Unbreak GNU head(1)
+_POSIX2_VERSION=199209
+export _POSIX2_VERSION
+
+case `uname -s 2>/dev/null` in
+OSF1*)
+	BIN_SH=xpg4
+	export BIN_SH
+	;;
+CYGWIN*)
+	os=cygwin
+	;;
+esac
+
+# If configure tells us to use a different egrep, create a wrapper function
+# to call it.  This means we don't need to change all the tests that depend
+# on a good implementation.
+if test "x${EGREP}" != "x"; then
+	egrep ()
+{
+	 ${EGREP} "$@"
+}
+fi
+
 SRC=`dirname ${SCRIPT}`
 
 # defaults