Add Android build support

Android makefile fragments are distributed as extra distribution files
by the GNU build system but are otherwise ignored.  The Android build
support is independent and does not rely on the GNU build system.

See android/README.android for more info.

Signed-off-by: Nate Bargmann <n0nb@n0nb.us>
build-win32.sh: Distribute hamlib.html

Distribute the Texinfo generated HTML manual which includes
documentation on rigctl, rotctl, rigctld, rotctld and no longer
distribute their respective PDF files in the MS Windows binary releases.