squeezelite: Specify all libraries to link against

squeezelite needs to link against libvorbis and libogg, some external
toolchains may not be able to automatically pull these dependencies in,
resulting the such linking errors:

mipsel-linux-gnu-gcc main.o slimproto.o buffer.o stream.o utils.o
output.o output_alsa.o output_pa.o output_stdout.o output_pack.o
decode.o flac.o pcm.o mad.o vorbis.o faad.o
-L/home/florian/dev/openwrt/trunk/staging_dir/target-mipsel-unknown-linux-gnu_glibc/usr/lib
-L/home/florian/dev/openwrt/trunk/staging_dir/target-mipsel-unknown-linux-gnu_glibc/lib
-L/home/florian/dev/toolchains/stbgcc-4.8-1.5/usr/lib
-L/home/florian/dev/toolchains/stbgcc-4.8-1.5/lib -znow -zrelro -lasound
-lpthread -lm -lrt  -lasound -lpthread -lm -lrt -lFLAC -lmad
-lvorbisfile -lfaad -o squeezelite
/home/florian/dev/toolchains/stbgcc-4.8-1.5/bin/../lib/gcc/mipsel-linux-gnu/4.8.5/../../../../mipsel-linux-gnu/bin/ld:
warning: libvorbis.so.0, needed by
/home/florian/dev/openwrt/trunk/staging_dir/target-mipsel-unknown-linux-gnu_glibc/usr/lib/libvorbisfile.so,
not found (try using -rpath or -rpath-link)
/home/florian/dev/toolchains/stbgcc-4.8-1.5/bin/../lib/gcc/mipsel-linux-gnu/4.8.5/../../../../mipsel-linux-gnu/bin/ld:
warning: libogg.so.0, needed by
/home/florian/dev/openwrt/trunk/staging_dir/target-mipsel-unknown-linux-gnu_glibc/usr/lib/libvorbisfile.so,
not found (try using -rpath or -rpath-link)
/home/florian/dev/openwrt/trunk/staging_dir/target-mipsel-unknown-linux-gnu_glibc/usr/lib/libvorbisfile.so:
undefined reference to `ogg_stream_reset'
collect2: error: ld returned 1 exit status

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

sound/squeezelite/Makefile

@@ -128,6 +128,7 @@ TARGET_LDFLAGS+= -lasound -lpthread -lm -lrt
 
 ifeq ($(BUILD_VARIANT),full)
     TARGET_CFLAGS+= -DLINKALL
+    TARGET_LDFLAGS+= -lvorbis -logg
 endif
 
 define Package/squeezelite/install