Merge changes from topic "mingw-clang"

* changes:
  Do not customize __format__ for Windows/MinGW to gnu_printf
  Adapt to switch to Clang for Windows host builds
  Update cflags for building Windows modules with Clang
tree: dffbe099db9f0c6cf9e1613088fc256feccf2e1e
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/