Log Message:
Update synergy pacakge to 1.3.7. (leaf package)

pkgsrc change:
- Add LICENSE.
- Add more example files.

Fixed Bugs of 1.3.7:

#1668   Scroll lock has opposite behavior 1.3.x 0
#2952   Visual C++ 2008 Redistributable unpacks to root of hard drive 1.3.6 0
#2939   The hook DLL (synrgyhk.dll) is not compiled to the bin dir 1.3.6 0
#2938   Argument --help does not work 1.3.6 0
#2834   Fix buildbot console (it has nothing on it) 1.3.6 0
#691    fix compilation errors for gcc 4.3 1.2.6 0
#1187   Compile broken for modern C++ 1.3.1 0
#683    Only cross screens on during special keypress 1.3.0 0
#128    In Linux focused window loses focus when cursor moved to another screen
(big problem for 1B.o3x.3ee) 12
#1663   "hos" != "host" 1.3.1 1
#610    Client side crash - Linux x64 1.3.5 2