remove Inotify build flag

Available for a long time in Linux, and only used there, so a flag is not
needed.

git-annex.cabal

@@ -37,9 +37,6 @@ Flag S3
 Flag WebDAV
   Description: Enable WebDAV support
 
-Flag Inotify
-  Description: Enable inotify support
-
 Flag Assistant
   Description: Enable git-annex assistant and watch command
 
@@ -177,7 +174,7 @@ Executable git-annex
     CPP-Options: -DWITH_ASSISTANT
 
   if flag(Assistant)
-    if os(linux) && flag(Inotify)
+    if os(linux)
       Build-Depends: hinotify
       CPP-Options: -DWITH_INOTIFY
     else

stack.yaml

@@ -3,7 +3,6 @@ flags:
     concurrentoutput: true
     tahoe: true
     tdfa: true
-    inotify: true
     feed: true
     webapp-secure: true
     production: true