Drop support for building without network-uri.

network-uri is available in Debian stable (backports) and testing,
so no need to complicate the cabal file anymore

CHANGELOG

@@ -13,6 +13,7 @@ git-annex (6.20170301.2) UNRELEASED; urgency=medium
     in the warning message.
   * Windows: Improve handling of shebang in external special remote
     program, searching for the program in the PATH.
+  * Drop support for building without network-uri.
 
  -- Joey Hess <id@joeyh.name>  Thu, 02 Mar 2017 12:51:40 -0400
 

git-annex.cabal

@@ -291,10 +291,6 @@ Flag Benchmark
   Description: Enable benchmarking
   Default: False
 
-Flag network-uri
-  Description: Get Network.URI from the network-uri package
-  Default: True
-
 Flag Dbus
   Description: Enable dbus support
 
@@ -318,6 +314,8 @@ Executable git-annex
    stm (>= 2.3),
    mtl (>= 2),
    uuid (>= 1.2.6),
+   network (>= 2.6),
+   network-uri (>= 2.6),
    process,
    data-default,
    case-insensitive,
@@ -376,11 +374,6 @@ Executable git-annex
   if os(Linux)
     GHC-Options: -optl-Wl,--as-needed
 
-  if flag(network-uri)
-    Build-Depends: network-uri (>= 2.6), network (>= 2.6)
-  else
-    Build-Depends: network (< 2.6), network (>= 2.4)
-
   if (os(windows))
     Build-Depends: Win32, Win32-extras, unix-compat (>= 0.4.1.3), setenv,
       process (>= 1.3.0.0)

stack.yaml

@@ -4,7 +4,6 @@ flags:
     production: true
     assistant: true
     pairing: true
-    network-uri: true
     s3: true
     testsuite: true
     webdav: true