Revert "Added dependency on concurrent-output; removed embedded copy."

This reverts commit 02eca2ae4cf51d8e83d94d8359e15ac053451109.

This seems to have broken propellor badly, in testing I'm seeing it
crash at the end of a run with "thread blocked indefinitely in an STM
transaction" and also during the run it printed out some odd output
like:

apache2:
apache2:

dummy IN SSHFP 4 1 35df80973f5877e4041f1b70947385eb2f6a0822
dummy IN SSHFP 4 2 3a0bb426e76eebc5c56e3b0f1428aa9d18539e9621bf8f9e3b7f56a4e7d81c85

Which seems like it might be output of commands that
propellor is supposed to be reading?

Seems likely that there's a bug or two that have crept
into then concurrent-output library since the version embedded in
propellor.

1 files changed, 44 insertions, 0 deletions

diff --git a/src/System/Console/Concurrent.hs b/src/System/Console/Concurrent.hs
new file mode 100644
index 00000000..12447637
--- /dev/null
+++ b/src/System/Console/Concurrent.hs
@@ -0,0 +1,44 @@
+-- | 
+-- Copyright: 2015 Joey Hess <id@joeyh.name>
+-- License: BSD-2-clause
+-- 
+-- Concurrent output handling.
+--
+-- > import Control.Concurrent.Async
+-- > import System.Console.Concurrent
+-- >
+-- > main = withConcurrentOutput $
+-- > 	outputConcurrent "washed the car\n"
+-- > 		`concurrently`
+-- >	outputConcurrent "walked the dog\n"
+-- >		`concurrently`
+-- > 	createProcessConcurrent (proc "ls" [])
+
+{-# LANGUAGE CPP #-}
+
+module System.Console.Concurrent (
+	-- * Concurrent output
+	withConcurrentOutput,
+	Outputable(..),
+	outputConcurrent,
+	errorConcurrent,
+	ConcurrentProcessHandle,
+#ifndef mingw32_HOST_OS
+	createProcessConcurrent,
+#endif
+	waitForProcessConcurrent,
+	createProcessForeground,
+	flushConcurrentOutput,
+	lockOutput,
+	-- * Low level access to the output buffer
+	OutputBuffer,
+	StdHandle(..),
+	bufferOutputSTM,
+	outputBufferWaiterSTM,
+	waitAnyBuffer,
+	waitCompleteLines,
+	emitOutputBuffer,
+) where
+
+import System.Console.Concurrent.Internal
+