Enable building and testing of ossaudiodev for Linux.

Lib/test/output/test_ossaudiodev

+test_ossaudiodev
+expected rate >= 0, not -1
+expected sample size >= 0, not -2
+nchannels must be 1 or 2, not 3
+unknown audio encoding: 177
+for linear unsigned 16-bit little-endian audio, expected sample size 16, not 8
+for linear unsigned 8-bit audio, expected sample size 8, not 16

setup.py

@@ -722,6 +722,7 @@ class PyBuildExt(build_ext):
         if platform == 'linux2':
             # Linux-specific modules
             exts.append( Extension('linuxaudiodev', ['linuxaudiodev.c']) )
+            exts.append( Extension('ossaudiodev', ['ossaudiodev.c']) )
 
         if platform == 'sunos5':
             # SunOS specific modules