Fix the PIE test in configure. opus-tools is compiled with PIE anyway,

so this is just a cosmetic change. Reported by and ok juanfra@

audio/opus-tools/patches/patch-configure

@@ -0,0 +1,20 @@
+$OpenBSD: patch-configure,v 1.1 2016/01/27 12:04:06 naddy Exp $
+--- configure.orig	Thu Jun 12 02:11:26 2014
++++ configure	Tue Jan 26 17:32:20 2016
+@@ -6319,14 +6319,14 @@ if test "$enable_pie" = "yes"; then :
+   saved_CFLAGS="$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"
+   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PIE support" >&5
+ $as_echo_n "checking for PIE support... " >&6; }
+   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+ /* end confdefs.h.  */
+-#include <opus/opus.h>
++#include <opus.h>
+ int
+ main ()
+ {