* configure.ac: Added check for sys/utsname.h header.

* configure.ac: Added check for sys/utsname.h header.
* src/vm/os.hpp: Properly includes above header.

* src/mm/codememory.c: Removed includes of "uncommon" headers.
* src/mm/gc-none.cpp: Likewise.
* src/mm/tlh.c: Likewise.
* src/native/vm/cldc1.1/com_sun_cldc_io_ResourceInputStream.cpp: Likewise.
* src/native/vm/cldc1.1/com_sun_cldc_io_j2me_socket_Protocol.cpp: Likewise.
* src/native/vm/gnuclasspath/java_lang_VMClassLoader.cpp: Likewise.
* src/native/vm/gnuclasspath/java_lang_VMRuntime.cpp: Likewise.
* src/native/vm/openjdk/jvm.cpp: Likewise.
* src/vm/exceptions.cpp: Likewise.
* src/vm/properties.cpp: Likewise.
* src/vm/signal.cpp: Likewise.
* src/vm/zip.cpp: Likewise.