sdl_sound: remove --program-prefix

--program-prefix is now set in the auto-target infrastructure.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/sdl_sound/sdl_sound.mk

@@ -31,8 +31,7 @@ SDL_SOUND_CONF_OPT = \
 	--with-sdl-prefix=$(STAGING_DIR)/usr \
 	--with-sdl-exec-prefix=$(STAGING_DIR)/usr \
 	--disable-sdltest \
-	--enable-static \
-	--program-prefix=''
+	--enable-static
 
 # enable mmx for newer x86's
 ifeq ($(BR2_i386)$(BR2_x86_i386)$(BR2_x86_i486)$(BR2_x86_i586)$(BR2_x86_pentiumpro)$(BR2_x86_geode),y)