SCons : Add bin to LIBPATH for Windows

The `9.0.0` dependencies moved DLL files to the `bin` directory, so
that directory needs to be added to `PATH` via the `LIBPATH` setting.

.github/workflows/main/options.windows

@@ -2,7 +2,7 @@ import os
 
 deps = os.environ.get( "CORTEX_BUILD_NAME" )
 includes = os.path.join( deps, "include" )
-libs = os.path.join( deps, "lib" )
+libs = os.path.join( deps, "lib" ) + os.pathsep + os.path.join( deps, "bin" )
 
 build = os.environ.get( "CORTEX_BUILD_NAME" )