Patch from Andre Hentz to fix os=cygwin/toolset=msvc combination.
* new/builtin.jam: Associate obj and lib extension with OBJ and
STATIC_LIB target types, to handle the above combination. The gcc
toolset overrides these extension explicitly.
* new/msvc.jam
(archive): Use bash syntax on cygwin.
[SVN r18210]
Vladimir Prus