Added waf buildscript.

Building on Linux will now be simple.

Issue
    $ CXXFLAGS='<crazy optimization flags you want>' ./waf configure
    $ ./waf
    $ sudo ./waf install
    $ sudo ldconfig
to build and install DSPFilters.

Alternatively, use
    $ ./waf configure --build-demo
to also build DSPFiltersDemo.

Note that building DSPFilters should be possible on any system,
but DSPFiltersDemo only gets configured to use POSIX libraries,
X11 and ALSA. Consequenty, building on BSD/UNIX/Linux should work,
but on other platforms, there may be some problems.

Tested on ArchLinux (with Python 3).

Author: kris7t

Diff for: .gitignore

@@ -0,0 +1,4 @@
+build
+.waf*
+.lock*
+.*.sw*

Diff for: waf

@@ -0,0 +1,83 @@
+
+import os, sys
+from waflib import Logs
+
+def options(opt):
+    opt.load('compiler_cxx')
+    config_options = opt.get_option_group('configure options')
+    config_options.add_option('--build-demo',
+        action='store_true',
+        dest='build_demo',
+        help='build the demo application [default: false]')
+
+def configure(conf):
+    conf.load('compiler_cxx')
+    configure_lib(conf)
+    if conf.options.build_demo:
+        Logs.warn('DSPFiltersDemo: demo application will also be built.')
+        configure_demo(conf)
+
+def configure_lib(conf):
+    pass
+
+def configure_demo(conf):
+    conf.env['BUILD_DEMO'] = True
+    configure_juce(conf)
+
+def configure_juce(conf):
+    juce_required_libs=[]
+    juce_required_packages=[]
+    
+    if os.name.startswith('posix') and not sys.platform.startswith('darwin'):
+        juce_required_libs+=['dl', 'pthread', 'rt']
+        juce_required_packages+=['freetype2', 'gl', 'glu', 'x11', 'xinerama', 'alsa', 'xext']
+    else:
+        # TODO: add Darwin and non-POSIX dependency checks
+        conf.fatal('DSPFiltersDemo: Building DSPFiltersDemo with waf is currently only possible on'
+            ' POSIX systems with X11.')
+
+    for l in juce_required_libs:
+        conf.check(
+            lib=l,
+            uselib_store=l)
+    for pkg in juce_required_packages:
+        conf.check_cfg(
+            package=pkg,
+            uselib_store=pkg,
+            args=['--cflags', '--libs'])
+    conf.env.append_value('JUCE_USELIBS', juce_required_libs)
+    conf.env.append_value('JUCE_USELIBS', juce_required_packages)
+
+
+def build(bld):
+    build_lib(bld)
+    if bld.env['BUILD_DEMO']:
+        build_demo(bld)
+
+def build_lib(bld):
+    dspfilters_include_dir = bld.path.find_dir('shared/DSPFilters/include')
+    bld.install_files('${PREFIX}/include',
+        dspfilters_include_dir.ant_glob('**/*.h'),
+        cwd=dspfilters_include_dir,
+        relative_trick=True)
+    bld.shlib(
+        source=bld.path.ant_glob('shared/DSPFilters/source/*.cpp'),
+        includes='shared/DSPFilters/include',
+        target='DSPFilters')
+
+def build_demo(bld):
+    build_juce(bld)
+    bld.program(
+        source=bld.path.ant_glob('shared/DSPFiltersDemo/source/*.cpp'),
+        includes=['shared/DSPFiltersDemo/source', 'shared/DSPFilters/include', 'shared/JuceAmalgam'],
+        use=bld.env['JUCE_USELIBS'] + ['JuceAmalgam', 'DSPFilters'],
+        target='DSPFiltersDemo')
+
+def build_juce(bld):
+    bld.stlib(
+        source=bld.path.ant_glob('shared/JuceAmalgam/*.cpp'),
+        includes='shared/JuceAmalgam',
+        use=bld.env['JUCE_USELIBS'],
+        target='JuceAmalgam')
+
+# vim: syntax=python