cmd/cgo: prevent redeclaration of _Ctype_void when C.void is used

CL 230037 changed cmd/cgo to emit "type _Ctype_foo = bar" aliases for
all C.foo types mentioned in the original Go source files. However,
cmd/cgo already emits an appropriate type definition for _Ctype_void.
So if a source file explicitly mentions C.void, this resulted in
_Ctype_void being declared multiple times.

This CL fixes the issue by suppressing the "type _Ctype_void =
_Ctype_void" alias before printing it. This should be safe because
_Ctype_void is the only type that's specially emitted in out.go at the
moment.

A somewhat better fix might be to fix how _Ctype_void is declared in
the cmd/cgo "frontend", but this is a less invasive fix.

Fixes #39877.

Change-Id: Ief264b3847c8ef8df1478a6333647ff2cf09b63d
Reviewed-on: https://go-review.googlesource.com/c/go/+/240180
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

misc/cgo/test/test.go

@@ -2200,3 +2200,7 @@ func test32579(t *testing.T) {
 // issue 38649
 
 var issue38649 C.netbsd_gid = 42
+
+// issue 39877
+
+var issue39877 *C.void = nil

src/cmd/cgo/out.go

@@ -98,6 +98,11 @@ func (p *Package) writeDefs() {
 
 	typedefNames := make([]string, 0, len(typedef))
 	for name := range typedef {
+		if name == "_Ctype_void" {
+			// We provide an appropriate declaration for
+			// _Ctype_void below (#39877).
+			continue
+		}
 		typedefNames = append(typedefNames, name)
 	}
 	sort.Strings(typedefNames)