buildsystem: don't force the contrib native binary directory

If the configure script needs to find a native tool that may be in there,
it will find it.

buildsystem/compile-libvlc.sh

@@ -579,7 +579,6 @@ if [ ! -e $VLC_BUILD_DIR/config.h -o "$AVLC_RELEASE" = 1 ]; then
     AS="${CROSS_TOOLS}as" \
     PKG_CONFIG_LIBDIR=$VLC_SRC_DIR/contrib/$TARGET_TUPLE/lib/pkgconfig \
     PKG_CONFIG_PATH=$VLC_SRC_DIR/contrib/$TARGET_TUPLE/lib/pkgconfig \
-    PATH=../contrib/bin:$PATH \
     ../configure --host=$TARGET_TUPLE \
         --with-contrib=${VLC_SRC_DIR}/contrib/${TARGET_TUPLE} \
         --prefix=${VLC_BUILD_DIR}/install/ \