configure: Fix remaining instances of mpg123_init check.
Spotted by Eric Pouech.
diff --git a/configure.ac b/configure.ac
index 1925035..1563876 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1413,9 +1413,9 @@
then
AC_CHECK_LIB(mpg123,mpg123_feed,[AC_SUBST(LIBMPG123,"-lmpg123")])
fi
-WINE_NOTICE_WITH(mpg123,[test "x$ac_cv_lib_mpg123_mpg123_init" != xyes],
+WINE_NOTICE_WITH(mpg123,[test "x$ac_cv_lib_mpg123_mpg123_feed" != xyes],
[libmpg123 ${notice_platform}development files not found (or too old), mp3 codec won't be supported.])
-test "x$ac_cv_lib_mpg123_mpg123_init" = xyes || enable_winemp3_acm=${enable_winemp3_acm:-no}
+test "x$ac_cv_lib_mpg123_mpg123_feed" = xyes || enable_winemp3_acm=${enable_winemp3_acm:-no}
dnl **** Check for libkstat ****
if test "$ac_cv_header_kstat_h" = "yes"
