accesibility/speech-dispatcher: Unbreak build with -fno-common

ld: error: duplicate symbol: GlobalFDSet
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(GlobalFDSet)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x148)

ld: error: duplicate symbol: MessagePausedList
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(MessagePausedList)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x138)

ld: error: duplicate symbol: MessageQueue
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(MessageQueue)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x10)

ld: error: duplicate symbol: SpeechdOptions
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(SpeechdOptions)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x60)

ld: error: duplicate symbol: SpeechdStatus
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(SpeechdStatus)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0xF8)

ld: error: duplicate symbol: client_specific_settings
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(client_specific_settings)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x140)

ld: error: duplicate symbol: custom_log_kind
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(custom_log_kind)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x230)

ld: error: duplicate symbol: custom_logfile
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(custom_logfile)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x228)

ld: error: duplicate symbol: debug_logfile
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(debug_logfile)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x238)

ld: error: duplicate symbol: element_free_mutex
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(element_free_mutex)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x8)

ld: error: duplicate symbol: fd_settings
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(fd_settings)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x120)

ld: error: duplicate symbol: fd_uid
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(fd_uid)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x130)

ld: error: duplicate symbol: language_default_modules
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(language_default_modules)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x128)

ld: error: duplicate symbol: last_p5_block
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(last_p5_block)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x18)

ld: error: duplicate symbol: logfile
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(logfile)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x220)

ld: error: duplicate symbol: logging_mutex
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(logging_mutex)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x110)

ld: error: duplicate symbol: output_layer_mutex
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(output_layer_mutex)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x118)

ld: error: duplicate symbol: p_msg_lc
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(p_msg_lc)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x28)

ld: error: duplicate symbol: p_msg_uid_lc
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(p_msg_uid_lc)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x30)

ld: error: duplicate symbol: pause_requested
>>> defined at speechd.c
>>>            speech_dispatcher-speechd.o:(pause_requested)
>>> defined at server.c
>>>            speech_dispatcher-server.o:(.bss+0x50)

accessibility/speech-dispatcher/Makefile

@@ -19,7 +19,7 @@ USES=		alias gettext gmake gnome libtool pathfix pkgconfig
 USE_GNOME=	glib20 intltool
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--without-espeak-ng
-CFLAGS+=	-I${LOCALBASE}/include
+CFLAGS+=	-fcommon -I${LOCALBASE}/include
 LDFLAGS+=	-L${LOCALBASE}/lib
 USE_LDCONFIG=	yes
 INSTALL_TARGET=	install-strip