synergy: fix build

Closes #3307

Synergy needs libXtst, a toolchain with wchar support and was missing
an include for exit().

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/synergy/Config.in

@@ -2,6 +2,8 @@ config BR2_PACKAGE_SYNERGY
 	bool "synergy"
 	depends on BR2_PACKAGE_XORG7
 	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_USE_WCHAR
+	select BR2_PACKAGE_XLIB_LIBXTST
 	help
 	  Synergy lets you easily share a single mouse and
 	  keyboard between multiple computers with different
@@ -10,5 +12,5 @@ config BR2_PACKAGE_SYNERGY
 
 	  http://synergy2.sourceforge.net/
 
-comment "synergy requires a toolchain with C++ support enabled"
-	depends on BR2_PACKAGE_XORG7 && !BR2_INSTALL_LIBSTDCPP
+comment "synergy requires a toolchain with C++ and WCHAR support enabled"
+	depends on BR2_PACKAGE_XORG7 && !BR2_INSTALL_LIBSTDCPP && !BR2_USE_WCHAR

package/synergy/synergy-1.3.1-exit.patch

@@ -0,0 +1,21 @@
+[PATCH] fix build issue in CArchDaemonUnix
+
+exit() needs #include <stdlib.h> for the prototype.
+
+Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
+---
+ lib/arch/CArchDaemonUnix.cpp |    1 +
+ 1 file changed, 1 insertion(+)
+
+Index: synergy-1.3.1/lib/arch/CArchDaemonUnix.cpp
+===================================================================
+--- synergy-1.3.1.orig/lib/arch/CArchDaemonUnix.cpp
++++ synergy-1.3.1/lib/arch/CArchDaemonUnix.cpp
+@@ -19,6 +19,7 @@
+ #include <sys/stat.h>
+ #include <fcntl.h>
+ #include <errno.h>
++#include <stdlib.h>
+ 
+ //
+ // CArchDaemonUnix

package/synergy/synergy.mk

@@ -11,6 +11,6 @@ SYNERGY_AUTORECONF = NO
 SYNERGY_INSTALL_STAGING = NO
 SYNERGY_INSTALL_TARGET = YES
 
-SYNERGY_DEPENDENCIES = xserver_xorg-server
+SYNERGY_DEPENDENCIES = xserver_xorg-server xlib_libXtst
 
 $(eval $(call AUTOTARGETS,package,synergy))