Add windows build docs to extra dist files.
diff --git a/Makefile.am b/Makefile.am
index d319329..02ee6f0 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -9,7 +9,7 @@ endif
EXTRA_DIST = example.conf m4/gnulib-cache.m4 linux-usb-cgminer \
ADL_SDK/readme.txt api-example.php miner.php \
- API.class API.java api-example.c
+ API.class API.java api-example.c windows-build.txt
SUBDIRS = lib compat ccan