Patch: allow specifiying flags to the VM used in javac script

[Robert Schuster]

Hi,
you may laugh but this is the most simple patch to make cross-compiling
OpenJDK easier. The reason is that I run ecj with jamvm/cacao which have
a far to small default maximum heap size to comple hotspot-tools.

With this patch I can ' JAVA_FLAGS="-Xmx4096M" configure ' and
everything is fine. :)

2009-01-07  Robert Schuster <robertschuster at fsfe.org>

  * javac.in: Added variable @JAVA_FLAGS@ .
  * configure.ac: Added AC_SUBST for JAVA_FLAGS.

Regards
Robert

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