libicu.a depends on libutil.a.

Work around automake warning:

    Makefile.am:310: warning: variable 'JAVA_SOURCES' is defined but no program or
    Makefile.am:310: library has 'JAVA' as canonical name (possible typo)

Closes #195

In current Android SDK releases, Ant support was removed. Move the
necessary build steps from the former Ant build system to our Makefile,
and call the required build tools from the Android SDK (aapt and dx),
Java SDK (javac) and Info-ZIP (zip) directly.

[mk: copied from Felix's commit
e52b906dba971a1173f9e8f83d32b52ee9f89af3 in the XCSoar project)

This will be used by filters which have internal buffers which need to
be flushed at the end, e.g. the "soxr" resampler.

This declaration is obsolete because MPD has switched on RTTI long
ago.

These attributes are printed in the "outputs" response, and the new
command "outputset" allows setting new values.

No attributes are currently implemented.

Signed-off-by: FlashSystems <developer@flashsystems.de>

If libupnp is installed in a non-standard location we must rely on the
include path provided by $(pkg-config --cflags libupnp). Relative to the
path given from that command no prefix must be used to find the respective
files.

Closes #155

Move its code to DeferEvent instead.

Allows defining a list of supported audio formats, and allows
switching on and off DoP with certain formats.

This is a first rough draft.  The setting syntax and its semantics may
still be redesigned.