JAVA_HOME nad tools.jar not needed for Java testing

tools.jar doesn't seem to be needed (in jdk9 anyway), so removing it.

Examples/test-suite/java/Makefile.in

@@ -6,10 +6,8 @@ LANGUAGE     = java
 JAVA         = @JAVA@
 JAVAC        = @JAVAC@
 JAVAFLAGS    = @JAVAFLAGS@
-JAVA_CLASSPATH_SEP = @JAVA_CLASSPATH_SEP@
 SCRIPTSUFFIX = _runme.java
-
-JAVA_HOME ?= @JAVA_HOME@
+JAVA_CLASSPATH = .
 
 srcdir       = @srcdir@
 top_srcdir   = ../@top_srcdir@
@@ -110,8 +108,6 @@ CommentParser.class:
 	echo "Compiling $(srcdir)/CommentParser.java"
 	$(COMPILETOOL) $(JAVAC) -classpath $(JAVA_CLASSPATH) -d . $(srcdir)/CommentParser.java
 
-JAVA_CLASSPATH := .
-$(DOXYGEN_TEST_CASES:=.cpptest): JAVA_CLASSPATH := "$(JAVA_HOME)/lib/tools.jar$(JAVA_CLASSPATH_SEP)."
 $(DOXYGEN_TEST_CASES:=.cpptest): CommentParser.class
 
 # Compiles java files then runs the testcase. A testcase is only run if