New build tool. Should even work on Windows, if Go 1.1 is available, without MinGW/msys/etc.

Change-Id: Idb197cc2309ae294ce42d41c7d35333d1cfed48c
Add a genfileembed package comment

Change-Id: I65bfd3c1956921bb8d1d805cd6df84bc376ec802
make.go: add the forgotten os.Chtimes in mirrorFile.

Now incremental builds are fast again.

Change-Id: Ibd0a6ef8f2bdec4f760476e5507ec0c3a17f110d
make.go: use a different temp GOPATH for sqlite-vs-not; add verbose flag

Change-Id: Iccb140f6ca740a77fce2510689d237aa9c456d21