shairport-sync: Get rid of libc++ dependency

Two features which are not used by the package depend on a libc++.
Removing the proper entries in the Makefile allow compilation without a
libc++.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

sound/shairport-sync/Makefile

@@ -8,7 +8,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=shairport-sync
 PKG_VERSION:=3.2.2
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://codeload.github.com/mikebrady/shairport-sync/tar.gz/$(PKG_VERSION)?
@@ -23,14 +23,13 @@ PKG_LICENSE_FILES:=COPYING LICENSES shairport.c
 PKG_BUILD_PARALLEL:=1
 PKG_FIXUP:=autoreconf
 
-include $(INCLUDE_DIR)/uclibc++.mk
 include $(INCLUDE_DIR)/package.mk
 
 define Package/shairport-sync/default
   SECTION:=sound
   CATEGORY:=Sound
   TITLE:=AirPlay compatible audio player
-  DEPENDS:=@AUDIO_SUPPORT $(CXX_DEPENDS) +libpthread +alsa-lib +libconfig +libdaemon +libpopt
+  DEPENDS:=@AUDIO_SUPPORT +libpthread +alsa-lib +libconfig +libdaemon +libpopt
   PROVIDES:=shairport-sync
   URL:=https://github.com/mikebrady/shairport-sync
 endef