Add ${JAVA_HOME}/lib/tools.jar to the CLASSPATH.

NOTE: JAVA_HOME is overridable but the default value is selected by bsd.java.mk
when isntalling the port.

--- bin/NetRexxC.sh.orig	Sun Aug 20 12:47:22 2000
+++ bin/NetRexxC.sh	Tue Apr  5 23:52:45 2005
@@ -29,6 +29,8 @@
 # -----------------------------------------------------------------
 #  2000.08.20 -- initial version derived from NetRexxC.bat
 
+JAVA_HOME="${JAVA_HOME:-"%%JAVA_HOME%%"}"
+
 if test $# -eq 0; then
   echo 'Usage:' $0 '[-run] [other options] filename'
   echo ' '
@@ -40,10 +42,10 @@
   netrexx_run=yes
 fi
 
-java -ms4M $NETREXX_JAVA COM.ibm.netrexx.process.NetRexxC $*
+"${JAVA_HOME}/bin/java" -ms4M $NETREXX_JAVA -cp "${JAVA_HOME}/lib/tools.jar":"%%JAVAJARDIR%%/NetRexxC.jar" COM.ibm.netrexx.process.NetRexxC $*
 if test $? -eq 0; then
   if test "$netrexx_run" = "yes"; then
     echo "Running $1..."
-    java $1
+    "${JAVA_HOME}/bin/java" $1
   fi
 fi