pin unix to already installed version

This prevents multiple versions of unix, from ghc and needed by newer
versions of some packages conflicting.

Had to update the bytestring and blaze-builder pins follow-on from this
change.

doc/bugs/Android_chroot_stuck_in_Cabal_hell.mdwn

@@ -18,3 +18,5 @@ collect2: error: ld returned 1 exit status
 Makefile:225: recipe for target 'android' failed
 make: *** [android] Error 1
 """]]
+
+> [[fixed|done]] --[[Joey]]

doc/bugs/Android_chroot_stuck_in_Cabal_hell/comment_4_3dd3b8005fef7a5dad69b7d1c1154235._comment

@@ -0,0 +1,7 @@
+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 4"""
+ date="2016-04-28T17:21:00Z"
+ content="""
+Reproduced, fixed.
+"""]]

standalone/android/cabal.config

@@ -1,4 +1,5 @@
-constraints: Crypto ==4.2.5.1,
+constraints: unix installed,
+             Crypto ==4.2.5.1,
              binary ==0.7.6.1,
              DAV ==1.0.3,
              HTTP ==4000.2.17,
@@ -85,6 +86,7 @@ constraints: Crypto ==4.2.5.1,
              http-conduit ==2.1.5,
              http-date ==0.0.2,
              http-types ==0.8.5,
+	     blaze-builder ==0.3.3.2,
              hxt ==9.3.1.4,
              hxt-charproperties ==9.1.1.1,
              hxt-regex-xmlschema ==9.0.4,
@@ -195,6 +197,6 @@ constraints: Crypto ==4.2.5.1,
              yesod-routes ==1.2.0.7,
              yesod-static ==1.2.4,
              zlib ==0.5.4.1,
-             bytestring ==0.10.4.0,
+             bytestring installed,
              scientific ==0.3.3.1,
              clock ==0.4.6.0