stdlib: correct case for the bcrypt import library

On Windows the filesystem is not case sensitive and this will link just fine.
However, the Windows SDK provides the import library with the lowercase name.
Adjust the name so that the link actually succeeds on case-sensitive file
systems (like on Linux).  This fixes the Windows cross-compile.

Author: compnerd

stdlib/public/stubs/Random.cpp

@@ -21,7 +21,7 @@
 #define WIN32_LEAN_AND_MEAN
 #include <Windows.h>
 #include <Bcrypt.h>
-#pragma comment(lib, "Bcrypt.lib")
+#pragma comment(lib, "bcrypt.lib")
 #else
 #include <errno.h>
 #include <fcntl.h>