package/twolame: libsndfile is optional

libsndfile is optional not mandatory since version 0.4.0 and
https://github.com/njh/twolame/commit/fe2770bffb9da10b7a26c82a340c81299ff82c76

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/twolame/Config.in

@@ -1,6 +1,5 @@
 config BR2_PACKAGE_TWOLAME
 	bool "twolame"
-	select BR2_PACKAGE_LIBSNDFILE
 	help
 	  TwoLAME is an optimised MPEG Audio Layer 2 (MP2) encoder
 	  based on tooLAME by Mike Cheng, which in turn is based upon

package/twolame/twolame.mk

@@ -6,9 +6,15 @@
 
 TWOLAME_VERSION = 0.4.0
 TWOLAME_SITE = http://downloads.sourceforge.net/project/twolame/twolame/$(TWOLAME_VERSION)
-TWOLAME_DEPENDENCIES = host-pkgconf libsndfile
 TWOLAME_INSTALL_STAGING = YES
 TWOLAME_LICENSE = LGPL-2.1+
 TWOLAME_LICENSE_FILES = COPYING
 
+ifeq ($(BR2_PACKAGE_LIBSNDFILE),y)
+TWOLAME_DEPENDENCIES += host-pkgconf libsndfile
+TWOLAME_CONF_OPTS += --enable-sndfile
+else
+TWOLAME_CONF_OPTS += --disable-sndfile
+endif
+
 $(eval $(autotools-package))