redundant space in FFI imports rejected by 6.12

GHC 6.10 and older accepted this code:

foreign import ccall unsafe " g_get_application_name"
  g_get_application_name :: (IO (Ptr CChar))

GHC 6.12 now rejects it with

glib/System/Glib/Utils.chs:81:28: Malformed entity string

The problem is the leading space in the C entity string. This code is generated by c2hs which is doing header ++ " " ++ ident however the header may be empty.

We should probably allow this code, though possibly with a warning. In parallel, c2hs could be fixed so it doesn't do that.

Trac metadata

Trac field	Value
Version	6.12.1 RC1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Parser)
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