Enable logging when full build fails.

Change-Id: If8fba29e2e83bc954832c644ccc8e2a1695a46d6
C: Add Bill Thiede (Google CLA)

Change-Id: I349d6f98b4b4b1b80df94120d07441e4e8ef59f7
Merge "Enable logging when full build fails."
Mark FUSE & pkg/fs files as Linux & Mac only, to fix FreeBSD build.

Also start of cross-compiling support in make.go.

Change-Id: Ic11ca2d433f135b07b3f6d7738eec9fe98590905