Update Cabal source-repository entries (re #8545)

This adapts the source-repository entries to match the new situation of
base.git, ghc-prim.git, integer-gmp.git, integer-simple.git, and
template-haskell.git being folded into ghc.git
Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

libraries/base/base.cabal

@@ -39,7 +39,8 @@ extra-source-files:
 
 source-repository head
     type:     git
-    location: http://git.haskell.org/packages/base.git
+    location: http://git.haskell.org/ghc.git
+    subdir:   libraries/base
 
 Flag integer-simple
     Description: Use integer-simple

libraries/ghc-prim/ghc-prim.cabal

@@ -14,12 +14,8 @@ description:
 
 source-repository head
     type:     git
-    location: http://git.haskell.org/packages/ghc-prim.git
-
-source-repository this
-    type:     git
-    location: http://git.haskell.org/packages/ghc-prim.git
-    tag:      ghc-prim-0.3.1.0-release
+    location: http://git.haskell.org/ghc.git
+    subdir:   libraries/ghc-prim
 
 flag include-ghc-prim
     Description: Include GHC.Prim in exposed-modules

libraries/integer-gmp/integer-gmp.cabal

@@ -47,12 +47,8 @@ extra-tmp-files:
 
 source-repository head
     type:     git
-    location: http://git.haskell.org/packages/integer-gmp.git
-
-source-repository this
-    type:     git
-    location: http://git.haskell.org/packages/integer-gmp.git
-    tag:      integer-gmp-0.5.1.0-release
+    location: http://git.haskell.org/ghc.git
+    subdir:   libraries/integer-gmp
 
 Library
     default-language: Haskell2010

libraries/integer-simple/integer-simple.cabal

@@ -12,7 +12,8 @@ build-type: Simple
 
 source-repository head
     type:     git
-    location: http://git.haskell.org/packages/integer-simple.git
+    location: http://git.haskell.org/ghc.git
+    subdir:   libraries/integer-simple
 
 Library {
     build-depends: ghc-prim

libraries/template-haskell/template-haskell.cabal

@@ -18,12 +18,8 @@ description:
 
 source-repository head
     type:     git
-    location: http://git.haskell.org/packages/template-haskell.git
-
-source-repository this
-    type:     git
-    location: http://git.haskell.org/packages/template-haskell.git
-    tag:      template-haskell-2.10.0.0-release
+    location: http://git.haskell.org/ghc.git
+    subdir:   libraries/template-haskell
 
 Library
     default-language: Haskell2010