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oss: remove check for machine/soundcard.h and libossaudio

Near as I can tell, no system actually has a machine/soundcard.h file.
The libossaudio library on NetBSD and OpenBSD is meant to emulate a
few ioctl() commands to facilitate porting of Linux applications.
As we have proper sndio support, this is of no use for SoX.

--- a/configure.ac

+++ b/configure.ac

@@ -609,10 +609,7 @@

-AC_OPTIONAL_FORMAT(oss, OSS, [AC_CHECK_HEADERS(sys/soundcard.h,,

-      [AC_CHECK_HEADERS(machine/soundcard.h,

-	  [AC_CHECK_LIB(ossaudio, _oss_ioctl, OSS_LIBS="$OSS_LIBS -lossaudio")],

-	  using_oss=no)])])

+AC_OPTIONAL_FORMAT(oss, OSS, [AC_CHECK_HEADERS(sys/soundcard.h,, uing_oss=no)])

--- a/src/oss.c

+++ b/src/oss.c

@@ -32,9 +32,6 @@

 #ifdef HAVE_SYS_SOUNDCARD_H

   #include <sys/soundcard.h>

 #endif

-#ifdef HAVE_MACHINE_SOUNDCARD_H

-  #include <machine/soundcard.h>

-#endif

 #ifdef HAVE_UNISTD_H

 #include <unistd.h>

 #endif