Problem with building E2 with libsigc++ 2.X

[ngc1927]

@Audioniek

In enigma2-plugins.mk, in: ifeq ($(MEDIAFW), eplayer3) section, is necessary add
SERVICEMP3_DEPS += $(D)/tools-libeplayer3

..otherwise build enigma2 with option 2
fail with error: not found -leplayer3

In this case compile ok, ( enigma2 not start for symbol problem )