* configure.ac (--with-jre-layout): Added.

* configure.ac (--with-jre-layout): Added.

* src/vm/global.h (CLASSPATH_LIBRARY_PATH): Removed.

* src/vm/vm.c [WITH_JRE_LAYOUT] (libgen.h, unistd.h): Added.
(cacao_prefix, cacao_libjvm, classpath_libdir): New global variables.
(version): Print gnu.classpath.boot.library.path instead of
java.library.path as this is the interesting one.
(vm_create): Added WITH_JRE_LAYOUT stuff.

* src/vm/vm.h (stackbottom): Removed.
(cacao_prefix, cacao_libjvm, classpath_libdir): Added.

* src/cacao/cacao.c [WITH_JRE_LAYOUT] (errno.h, libgen.h, unistd.h):
Added.
(main): Added WITH_JRE_LAYOUT stuff.

* src/native/vm/gnu_classpath_VMSystemProperties.c (vm/vm.h): Added.
(preInit): Set env_java_home to cacao_prefix and
gnu.classpath.boot.library.path to classpath_libdir.

* src/native/native.c (native_init): Use cacao_libjvm in lt_dlopenext
call.