Build only selected build targets on AppVeyor.
Build only selected build targets on AppVeyor.

Currently we cannot build all the Mozc binaries on AppVeyor within the time
limit of free plan (40 minutes).  Hence we build only selected build targets
on AppVeyor.

This CL only affects AppVeyor CI configurations.  No changes in production.

BUG=none
TEST=none

kbc-developers/Mozc,google/mozc,kbc-developers/Mozc,UIKit0/mozc,UIKit0/mozc,kbc-developers/Mozc,UIKit0/mozc,takahashikenichi/mozc,takahashikenichi/mozc,google/mozc,UIKit0/mozc,fcitx/mozc,fcitx/mozc,UIKit0/mozc,takahashikenichi/mozc,UIKit0/mozc,kbc-developers/Mozc,kbc-developers/Mozc,takahashikenichi/mozc,fcitx/mozc,fcitx/mozc,takahashikenichi/mozc,takahashikenichi/mozc,takahashikenichi/mozc,kbc-developers/Mozc,google/mozc,kbc-developers/Mozc,UIKit0/mozc,fcitx/mozc,google/mozc,google/mozc