ensure that v fmt can be run over most .v files on each PR

vlib/builtin/hashmap/hashmap.v

@@ -36,7 +36,7 @@ const (
 
 const(
 	fnv64_prime        = 1099511628211
-	fnv64_offset_basis = u64(14695981039346656037)
+	fnv64_offset_basis = 14695981039346656037
 )
 
 const(

vlib/os2/keep_vfmt_happy.v

@@ -0,0 +1,2 @@
+//this keeps vfmt happy
+module os2

vlib/sdl/examples/tvintris/tvintris.v

@@ -7,6 +7,7 @@
 
 module main
 
+import filepath
 import rand
 import time
 import os

vlib/sdl/ttf/ttf.v

@@ -1,5 +1,7 @@
 module ttf
 
+import sdl
+
 #include <SDL_ttf.h>
 
 [typedef]
@@ -132,4 +134,5 @@ fn C.TTF_CloseFont(font &TTF_Font)
 
 pub const (
   version = '0.0.1'
+  sdl_version = sdl.version // TODO: remove this hack to mark sdl as used; avoids warning
 )