samba36: fix build (issue #5574)

As indicated in #5574 samba fails to build with linker error due to lack
of talloc_* functions when the packet libtalloc also gets build.

According to Makefile it is compiled with "--without-libtalloc" option.
Running ./configure --help shows that there is another option connected
to libtalloc: --enable/disable-external-libtalloc.
Adding this option fixes build.

Signed-off-by: Jakub Tymejczyk <jakub@tymejczyk.pl>

package/network/services/samba36/Makefile

@@ -101,6 +101,7 @@ CONFIGURE_ARGS += \
 	--prefix=/ \
 	--disable-avahi \
 	--disable-cups \
+	--disable-external-libtalloc \
 	--disable-pie \
 	--disable-relro \
 	--disable-static \