configure: limit javac VM usage

Similarly, restrict javac to 128M, which is enough for me with JDK 1.7
on Linux x86_64.

Change-Id: I5b1e3435026b8b69bf7afe8b5236c3dc09857f49

config_host.mk.in

@@ -289,6 +289,7 @@ export JAVACISGCJ=@JAVACISGCJ@
 export JAVACOMPILER=@JAVACOMPILER@
 export JAVADOC=@JAVADOC@
 export JAVADOCISGJDOC=@JAVADOCISGJDOC@
+export JAVAFLAGS=@JAVAFLAGS@
 export JAVAIFLAGS=@JAVAIFLAGS@
 export JAVA_CLASSPATH_NOT_SET=@JAVA_CLASSPATH_NOT_SET@
 export JAVAINTERPRETER=@JAVAINTERPRETER@

configure.ac

@@ -6715,6 +6715,8 @@ you must use the "--with-jdk-home" configure option explicitly])
 
             # set to limit VM usage for JunitTests
             JAVAIFLAGS=-Xmx64M
+            # set to limit VM usage for javac
+            JAVAFLAGS=-J-Xmx128M
         fi
     else
         AC_MSG_ERROR([Java not found. You need at least jdk-1.5, or gcj-4])
@@ -7033,6 +7035,7 @@ AC_SUBST(JAVACOMPILER)
 AC_SUBST(JAVADOC)
 AC_SUBST(JAVAINTERPRETER)
 AC_SUBST(JAVAIFLAGS)
+AC_SUBST(JAVAFLAGS)
 AC_SUBST(JAVA_CLASSPATH_NOT_SET)
 AC_SUBST(JAVA_HOME)
 AC_SUBST(JAVA_SOURCE_VER)