FIXED: GHC 7.6 warnings: FFI constructor exposure.

It seems that FFI _constructors_ will need to be exposed in GHC 7.6,
for all types actually used for foreign calls.

To silence warnings I added:
import Foreign.C.Types(CSize(..), CInt(..), CUInt(..), CULLong(..))

src/Control/Parallel/OpenCL/Context.chs

@@ -42,7 +42,7 @@ module Control.Parallel.OpenCL.Context(
 import Foreign( 
   Ptr, FunPtr, nullPtr, castPtr, alloca, allocaArray, peek, peekArray, 
   ptrToIntPtr, intPtrToPtr, withArray )
-import Foreign.C.Types( CSize )
+import Foreign.C.Types( CSize(..), CInt(..), CUInt(..), CULLong(..) ) -- expose FFI type constructors
 import Foreign.C.String( CString, peekCString )
 import Foreign.Storable( sizeOf )
 import Control.Parallel.OpenCL.Types( 

src/Control/Parallel/OpenCL/Query.chs

@@ -67,7 +67,7 @@ module Control.Parallel.OpenCL.Query(
 -- -----------------------------------------------------------------------------
 import Foreign( Ptr, nullPtr, castPtr, alloca, allocaArray, peek, peekArray )
 import Foreign.C.String( CString, peekCString )
-import Foreign.C.Types( CSize )
+import Foreign.C.Types( CSize(..), CInt(..), CUInt(..), CULLong(..) ) -- expose FFI type constructors
 import Foreign.Storable( sizeOf )
 import Control.Parallel.OpenCL.Types( 
   CLbool, CLint, CLuint, CLulong, CLPlatformInfo_, CLDeviceType_,