CXXFLAGS should be set before AC_PROG_CXX.  This patch uses a syntax
allowing it to be overridden during "env CXXFLAGS=... ./configure",
"./configure CXXFLAGS=..." or during "make CXXFLAGS=..."

Keeps previous behaviour of -O3 for normal builds, -g -O0 for debug
builds, and keeps the define __RTAUDIO_DEBUG__, however this is done
using AC_DEFINE.

Port the build system to automake

Revert "duplex test: 64 bit compatibility"

Fix version and add version check

This reverts commit f639653f5e.

This change breaks the build with g++ 5.2.1 (Ubuntu 15.10).

Release lock if GetCurrentPosition from DS failed

Multiple minor compile fixes with modern C++

fix compile errors with -D__MACOSX_CORE__

duplex test: 64 bit compatibility

Merge of ALSA underrun warning fix.

Merge of OS-X closeStream() fix to remove property listener.

Trying to merge OS-X closeStream() update.

This change was necessary to prevent BAD ACCESS when compiling on 64 bit OSX

Fixes for WASAPI / ASIO

Static analysis fixes

Fix for NULL options in PULSE audio backend in probeDeviceOpen

Fix calloc-free mismatch

Add algorithm header include

The check if ( subdevice != -1 ) was being done on a potentially
uninitialized variable.

Use free() for allocated memory by calloc (not delete).
Deleting calloc-ed memory will become problem in the environment which
overrides global "operator delete" like some game engine.

Without algorithm header, Visual Studio complaints that std::max is not
declared and defined.
Including algorithm header resolves this issue.