registrar ClipboardHandler: Style fixes.
Make TargetLibstdc++ work for libbe_test target

Needed for the test_app_server.
The logic here may need some improvements, but I'm not sure how to find
the right library name in all cases. I fixed at least the x86_gcc2 case
here.
Fix "strict aliasing rules" warnings

Treated as errors when trying to build the test_app_server for x86_64.
Fix SVGView test build (missing strings.h include)