configure.ac: remove a non-valid character

This patch removes a non-valid character inside HAVE_COREAUDIO.
This char is difficult to see if you editor is not able
to show non-valid char.

But carefully checking configure log show this text without the patch:

./configure: line 6831: $'\302\240test': command not found

You can also see it using Emacs that detects such bad char.

Change-Id: I1e1e62fb6e03c42ac9d9758bc44db33fad088482
Tuleap: #909

configure.ac

@@ -102,7 +102,7 @@ AM_CONDITIONAL(HAVE_IOS,   test "${HAVE_IOS}" = "1")
 
 dnl FIXME this should be deduced automatically
 AC_DEFINE_UNQUOTED([HAVE_COREAUDIO],
-                    `if test "${HAVE_OSX}" = "1" || test "${HAVE_IOS}" = "1"; then echo 1; else echo 0; fi`,
+                    `if test "${HAVE_OSX}" = "1" || test "${HAVE_IOS}" = "1"; then echo 1; else echo 0; fi`,
                     [Define if you have CoreAudio])
 
 dnl Android is linux, but a bit different