cl.exe: Support -Wl,--runtime= in addition to --runtime=.
cl.exe: Support -Wl,--runtime= in addition to --runtime=.

We need to pass it under this form to prevent libtool from removing it.
But sometimes (such as in configure tests), the compilation is done
without libtool and cl.exe receives the -Wl,--runtime= directly.

	* msvc/link.exe: Support -Wl,--runtime=.

aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport