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Fix PIE configure test

In opus-tools, the current PIE configure test assumes that the opus
headers have been installed under the default header search path
of the compiler.  This isn't necessarily the case (/usr/local,
/opt, ...).

Use the detected opus include location instead.

Signed-off-by: Ralph Giles <giles@thaumas.net>

--- a/configure.ac

+++ b/configure.ac

@@ -261,11 +261,11 @@

   saved_CFLAGS="$CFLAGS"

   saved_LDFLAGS="$LDFLAGS"

   saved_LIBS="$LIBS"

-  CFLAGS="$CFLAGS -fPIE"

+  CFLAGS="$CFLAGS $OPUS_CFLAGS -fPIE"

   LDFLAGS="$LDFLAGS -pie -Wl,-z,relro -Wl,-z,now"

   LIBS="$LIBS $OPUS_LIBS"

   AC_MSG_CHECKING([for PIE support])

-  AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <opus/opus.h>]],

+  AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <opus.h>]],

                                   [[OpusDecoder *dec = opus_decoder_create(48000, 2, 0L)]])],

     [ AC_MSG_RESULT([yes]) ],

     [ AC_MSG_RESULT([no])