Makefile.vc: add DLL configs

(release|debug)-dynamic
These configurations will produce a dll in bin/ and an import lib under
lib/.
Currently the -noasm switch in the examples will be disabled for these
builds due to a dependency on VP8EncGetCPUInfo.

Change-Id: I2cbac0064f0e500698d14ffc03200791ca837090
3 files changed