Extract get_uname to lib/osinfo.

.gitignore

Makefile.am

src/common/compat.c

src/common/compat.h

src/include.am

src/lib/osinfo/.may_include

src/lib/osinfo/include.am

src/lib/osinfo/uname.c

src/lib/osinfo/uname.h

src/or/config.c

src/or/main.c

src/or/router.c

src/test/test_dir.c

src/test/test_options.c