c: fix some compatible type declarations

When K&R prototypes are present, definition of compatible types and
composite types becomes recursive. For example

`int f(int (*)())`
should be compatible with
`int f(int (*)(int))`

etc

1 files changed, 1 insertions, 0 deletions

diff --git a/src/c_type.h b/src/c_type.h
index 1347fcc..3b1e022 100644
--- a/src/c_type.h
+++ b/src/c_type.h
@@ -135,6 +135,7 @@ bool getfield(FieldData *res, Type, internstr);
 Type completetype(internstr name, int id, TypeData *td);
 Type typedecay(Type);
 bool assigncompat(Type dst, Type src);
+bool typescompat(Type *pcomposite, Type, Type);
 enum typetag intpromote(enum typetag);
 Type cvtarith(Type a, Type b);
 Type complex2struct(Type);