Don't use ADD_REVISION=1 for AppVeyor for now.

See https://github.com/andyli/haxe/commit/4d67266fb6e94fc29644f314091c1520b8d95278

appveyor.yml

@@ -46,7 +46,7 @@ install:
 build_script:
     - 'cd %APPVEYOR_BUILD_FOLDER%'
     - 'set PATH=%PATH%;%APPVEYOR_BUILD_FOLDER%'
-    - '%CYG_ROOT%/bin/bash -lc "cd \"$OLDPWD\" && make -s -f Makefile.win WODI=wodi%WODI_ARCH% OCAMLOPT=ocamlopt.opt ADD_REVISION=1"'
+    - '%CYG_ROOT%/bin/bash -lc "cd \"$OLDPWD\" && make -s -f Makefile.win WODI=wodi%WODI_ARCH% OCAMLOPT=ocamlopt.opt"'
     - '%CYG_ROOT%/bin/bash -lc "cd \"$OLDPWD\" && make -s -f Makefile.win WODI=wodi%WODI_ARCH% OCAMLOPT=ocamlopt.opt tools"'
     - cd %APPVEYOR_BUILD_FOLDER%/tests/
     - mkdir "%HAXELIB_ROOT%"