Fixes PR93.

Fixes PR93.
* src/native/vm/openjdk/jvm.c (JVM_RegisterSignal): Use same flags as
HotSpot.
* src/vm/signal.c (signal_thread_handler)
[WITH_JAVA_RUNTIME_LIBRARY_OPENJDK]: Dispatch unknown signals to Java.
* src/vmcore/class.c [WITH_JAVA_RUNTIME_LIBRARY_OPENJDK]
(class_sun_misc_Signal): New global variable.
* src/vmcore/class.h: Likewise.
* src/vmcore/linker.c (linker_init)
[WITH_JAVA_RUNTIME_LIBRARY_OPENJDK]: Link class_sun_misc_Signal.
* src/vmcore/loader.c (loader_init)
[WITH_JAVA_RUNTIME_LIBRARY_OPENJDK]: Load class_sun_misc_Signal.
* src/vmcore/utf8.c (utf_dispatch): New global variable.
(utf8_init): Initialize utf_dispatch.
* src/vmcore/utf8.h: Likewise.

--HG--
extra : transplant_source : %91%CA%9C%B0%9Ay2H%BAc%B2%8D%F2%11%F4%E9%28/%3F%8B