Enable building with git-annex benchmark by default

Only turning it off when the criterion library is not installed.

Not enabled for osx or i386ancient yet since that will need some
invesitgation to update their respective stack.yaml files.

CHANGELOG

@@ -38,6 +38,8 @@ git-annex (8.20200909) UNRELEASED; urgency=medium
   * Parse youtube-dl progress output, which lets progress be displayed
     when doing concurrent downloads.
   * Fix build with Benchmark build flag.
+  * Enable building with git-annex benchmark by default, only turning it
+    off when the criterion library is not installed.
 
  -- Joey Hess <id@joeyh.name>  Mon, 14 Sep 2020 18:34:37 -0400
 

debian/control

@@ -79,6 +79,7 @@ Build-Depends:
 	libghc-socks-dev,
 	libghc-vector-dev,
 	libghc-filepath-bytestring-dev,
+	libghc-criterion-dev,
 	lsof [linux-any],
 	ikiwiki,
 	libimage-magick-perl,

git-annex.cabal

@@ -270,7 +270,7 @@ Flag MagicMime
 
 Flag Benchmark
   Description: Enable benchmarking
-  Default: False
+  Default: True
 
 Flag DebugLocks
   Description: Debug location of MVar/STM deadlocks

stack.yaml

@@ -8,7 +8,7 @@ flags:
     magicmime: false
     dbus: false
     debuglocks: false
-    benchmark: false
+    benchmark: true
     networkbsd: true
     gitlfs: true
     httpclientrestricted: true