fix(cmake): libboost Windows XP compatibility fix (#270)

Force Boost.Uuid to use obsolete CryptoAPI for Windows XP compatibility,
as the new Cryptography API: Next Generation (CNG) requires minimum
version of Windows Vista.

Fixes rime/weasel#337

CMakeLists.txt

@@ -144,7 +144,8 @@ if(MSVC)
     # stdint.h is missing from VS2010
     include_directories(${PROJECT_SOURCE_DIR}/thirdparty/include/msvc)
   endif()
-  add_definitions("/wd4244 /wd4996")
+  # Force Boost.Uuid to use wincrypt as random provider instead of bcrypt for Windows XP compatibility
+  add_definitions("/wd4244 /wd4996 /DBOOST_UUID_RANDOM_PROVIDER_FORCE_WINCRYPT")
 endif()
 
 if(UNIX)