alsa-lib: fix noMMU build

Add a patch to use vfork() instead of fork().

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/alsa-lib/alsa-lib-no-mmu.patch

@@ -0,0 +1,44 @@
+Don't use fork() on noMMU platforms
+
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+
+Index: alsa-lib-1.0.26/configure.in
+===================================================================
+--- alsa-lib-1.0.26.orig/configure.in	2012-09-06 10:55:14.000000000 +0200
++++ alsa-lib-1.0.26/configure.in	2013-03-09 16:22:08.000000000 +0100
+@@ -66,6 +66,8 @@
+ AM_CONDITIONAL(ALSA_HSEARCH_R, [test "x$HAVE_HSEARCH_R" != xyes])
+ AC_CHECK_FUNCS([uselocale])
+ 
++AC_CHECK_FUNC([fork])
++
+ SAVE_LIBRARY_VERSION
+ AC_SUBST(LIBTOOL_VERSION_INFO)
+ 
+Index: alsa-lib-1.0.26/src/pcm/pcm_direct.c
+===================================================================
+--- alsa-lib-1.0.26.orig/src/pcm/pcm_direct.c	2012-09-06 10:55:14.000000000 +0200
++++ alsa-lib-1.0.26/src/pcm/pcm_direct.c	2013-03-09 16:22:51.000000000 +0100
+@@ -424,13 +424,21 @@
+ 		close(dmix->server_fd);
+ 		return ret;
+ 	}
+-	
++
++#ifdef HAVE_FORK
+ 	ret = fork();
++#else
++	ret = vfork();
++#endif
+ 	if (ret < 0) {
+ 		close(dmix->server_fd);
+ 		return ret;
+ 	} else if (ret == 0) {
++#ifdef HAVE_FORK
+ 		ret = fork();
++#else
++		ret = vfork();
++#endif
+ 		if (ret == 0)
+ 			server_job(dmix);
+ 		_exit(EXIT_SUCCESS);

package/alsa-lib/alsa-lib.mk

@@ -11,6 +11,7 @@ ALSA_LIB_LICENSE = LGPLv2.1+
 ALSA_LIB_LICENSE_FILES = COPYING
 ALSA_LIB_INSTALL_STAGING = YES
 ALSA_LIB_CFLAGS=$(TARGET_CFLAGS)
+ALSA_LIB_AUTORECONF = YES
 ALSA_LIB_CONF_OPT = --with-alsa-devdir=$(call qstrip,$(BR2_PACKAGE_ALSA_LIB_DEVDIR)) \
 		    --with-pcm-plugins="$(call qstrip,$(BR2_PACKAGE_ALSA_LIB_PCM_PLUGINS))" \
 		    --with-ctl-plugins="$(call qstrip,$(BR2_PACKAGE_ALSA_LIB_CTL_PLUGINS))" \