enc_bcrypt.cpp: Get rid of the libxcrypt dependency by including code from libxcrypt, and move enc_bcrypt out of extras

data/modules.example.conf

@@ -9,23 +9,6 @@
  * running the 'extras' script on Linux and UNIX.
  */
 
-/*
- * enc_bcrypt [EXTRA]
- *
- * Adds the possibility to store passwords using bcrypt.
- * This follows the same rules as the other encryption modules,
- * eg. if you want it to be your primary encryption method it must
- * be loaded before any other encryption modules.
- * See the Encryption section of services.conf for more information.
- *
- * Requires libxcrypt.
- */
-#module
-{
-	name = "enc_bcrypt"
-	rounds = "10"
-}
-
 /*
  * help
  *