ffi: fix problems caught by g++.

* ffi.c (float_s): Variable removed. This is a duplicate
definition; we already have this symbol in lib.c.
(ffi_type_s): Duplicate definition removed; it is
repeated two lines below.
(ffi_str_put): Remove pointless const qualifier on u8s
variable.
(ffi_call_wrap): Cast return value of alloca. Also,
rc pointer needs to be cast to mem_t *.
(ffi_init): Remove initialization of float_s.

* ffi.h (float_s): Declaration removed.

1 files changed, 1 insertions, 1 deletions

diff --git a/ffi.h b/ffi.h
index 79b5dd2e..fafee40f 100644
--- a/ffi.h
+++ b/ffi.h
@@ -35,7 +35,7 @@ extern val short_s, ushort_s;
 extern val int_s, uint_s;
 extern val long_s, ulong_s;
 
-extern val float_s, double_s;
+extern val double_s;
 
 extern val wstr_s;