If the header valgrind/memcheck.h is available, add
VALGRIND_MAKE_MEM_NOACCESS() and VALGRIND_MAKE_MEM_UNDEFINED()
support, which enables nice warnings in the valgrind memory checker.

Another "remove redundant explicit $enableval assignments" breakage.

The patch "remove redundant explicit $enableval assignments" broke
several options with non-standard variable names.

Most strings have no capitalization at the beinning, make all strings
non-capital.

Add 'Streaming Support section to the configure display, clarify
the text and unify with the rest of the display.

The configure problem was:
./configure: line 6934: ,: command not found

The lastfm input plugin enables MPD to play lastfm:// URLs.  This
plugin is not complete yet: it plays only the first song in the
last.fm playlist, and the playlist parser isn't even implemented
properly.

Even when --enable-documentation is passed, don't abort if "xmlto" was
not found.

[mk: adapted to new output plugin API]

Moved generic compiler options to AM_CFLAGS.  MPD_CFLAGS/MPD_LIBS will
hopefully fade away one day, in favor of more fine-grained variables.

Removed superfluous commas.

Recursive Makefiles are inefficient and error prone (no proper way to
declare dependencies).  Since there's no disadvantage in having one
single Makefile, let's do it.

Removed shout's encoder plugin API in favor of the new generic encoder
plugin API.

This new LAME encoder plugin is based on the existing shout_mp3.c
plugin.

This new vorbis encoder plugin is based on the existing shout_ogg.c
plugin.

The new generic encoder API will replace shout's custom encoder API.

The configure.ac script does not care about the host architecture, it
only cares about the OS.  Use ${host_os} instead of ${host} to
simplify the matching expressions.

Without AC_CANONICAL_HOST, ${host_os} etc. are not defined.

The switch syntax is "--enable-test".  There are no test programs yet.

Use faacDecInit2() instead of AudioSpecificConfig() to detect the AAC
track in the MP4 file.  This has a great advantage: it initializes the
libfaad decoder, which the caller would normally do anyway - but now
we can go without the AudioSpecificConfig() call.  When decoder==NULL
(called from mp4_tag_dup()), fall back to a mp4ff_get_track_type()==1
check, like other audio players do.

When configured with --enable-documentation, use doxygen.

Currently, only the sidplay decoder plugin requires C++, and in all
other cases, MPD could build well without a C++ compiler.
Unfortunately, autoconf/automake are confused when we have a
conditional AC_PROG_CXX check.  We could add lots of workarounds for
individual problems, but let's just always require a C++ compiler, and
forget about this autotools limitation.