audiofile: regenerate configure to fix issues

Audiofile's shipped configure script is outdated so regenerate to fix
issues like:
http://autobuild.buildroot.net/results/659fd28b0a3fa15ecd1b32e8a08dd441465459c1/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/audiofile/audiofile.mk

@@ -10,6 +10,8 @@ AUDIOFILE_INSTALL_STAGING = YES
 AUDIOFILE_CONF_ENV = ac_cv_prog_cc_c99='-std=gnu99'
 AUDIOFILE_CONF_OPT = --disable-examples --disable-docs
 AUDIOFILE_DEPENDENCIES = host-pkgconf
+# configure is outdated and has old bugs because of it
+AUDIOFILE_AUTORECONF = YES
 AUDIOFILE_LICENSE = GPLv2+ LGPLv2.1+
 AUDIOFILE_LICENSE_FILES = COPYING COPYING.GPL