Replace TRUE/FALSE with true/false in zbeacon.c to fix *NIX builds

* Now that stdbool is setup properly, true/false are valid
* TRUE/FALSE definitions were removed by 5b341b4940
Fix Solaris builds - they need sys/sockio.h for SIOCGIFADDR defs
Add configurations to the solution file to build czmq DLLs
 * Adds two new configurations in the Solution: DebugDLL and ReleaseDLL
 * czmq_selftest does not build when the DLL config is selected because
   the *_test() functions aren't exported by the DLL, so the build would
   fail
Merge pull request #127 from vortechs2000/fix_unix

Fix *nix builds
Merge pull request #128 from vortechs2000/BuildsWindowsDLLs

Add configurations to the solution file to build czmq DLLs for Windows builds