ia32: fix: ia32_GetCallTarget wasn't always initializing target
x86_x64: use macro implementation for rdtsc to reduce timing overhead
This was SVN commit r7160.
- factor cursor and clipboard out of sysdep.h
- remove empty sysdep.cpp
- wcpu: remove profiler code (it's in wprofiler.cpp if we ever need it)
- robustify clipboard code
- wsysdep: move code to determine app window into wutil; it's now used
by the clipboard code
This was SVN commit r5364.
