Bump hekate to v6.4.0 and Nyx to v1.8.0

Versions.inc

@@ -1,11 +1,11 @@
 # IPL Version.
 BLVERSION_MAJOR := 6
-BLVERSION_MINOR := 3
-BLVERSION_HOTFX := 1
+BLVERSION_MINOR := 4
+BLVERSION_HOTFX := 0
 BLVERSION_REL   := 0
 
 # Nyx Version.
 NYXVERSION_MAJOR := 1
-NYXVERSION_MINOR := 7
+NYXVERSION_MINOR := 8
 NYXVERSION_HOTFX := 0
 NYXVERSION_REL   := 0