deskutils/ydotool: drop unused dependencies after 776f54e2

 $ poudriere testport -j 122amd64 deskutils/ydotool
[...]
 =>> Checking shared library dependencies
- 0x0000000000000001 NEEDED               Shared library: [libboost_program_options.so.1.72.0]
- 0x0000000000000001 NEEDED               Shared library: [libc++.so.1]
  0x0000000000000001 NEEDED               Shared library: [libc.so.7]
- 0x0000000000000001 NEEDED               Shared library: [libcxxrt.so.1]
- 0x0000000000000001 NEEDED               Shared library: [libdl.so.1]
  0x0000000000000001 NEEDED               Shared library: [libepoll-shim.so.0]
- 0x0000000000000001 NEEDED               Shared library: [libevdevPlus.so.0]
- 0x0000000000000001 NEEDED               Shared library: [libgcc_s.so.1]
- 0x0000000000000001 NEEDED               Shared library: [libm.so.5]
- 0x0000000000000001 NEEDED               Shared library: [libthr.so.3]
- 0x0000000000000001 NEEDED               Shared library: [libuInputPlus.so.0]
- 0x0000000000000001 NEEDED               Shared library: [libydotool.so.0]