Removed Socket.h from SRCS

src/Makefile.am

@@ -2,8 +2,7 @@ bin_PROGRAMS = aria2c
 aria2c_SOURCES = main.cc\
 	option_processing.cc\
 	version_usage.cc
-SRCS =  Socket.h\
-	SocketCore.cc SocketCore.h\
+SRCS =  SocketCore.cc SocketCore.h\
 	BinaryStream.h\
 	Command.cc Command.h\
 	AbstractCommand.cc AbstractCommand.h\