vfmt: skip {} for pure fn declarations (let the bodies hit the floor)

vlib/v/fmt/fmt.v

@@ -1219,9 +1219,11 @@ pub fn (mut f Fmt) fn_decl(node ast.FnDecl) {
 	f.attrs(node.attrs)
 	f.write(node.stringify(f.table, f.cur_mod)) // `Expr` instead of `ast.Expr` in mod ast
 	if node.language == .v {
-		f.writeln(' {')
+		if !node.no_body {
-		f.stmts(node.stmts)
+			f.writeln(' {')
-		f.write('}')
+			f.stmts(node.stmts)
+			f.write('}')
+		}
 		if !node.is_anon {
 			f.writeln('\n')
 		}

vlib/v/fmt/tests/fn_headers_with_no_bodies_keep.vv

@@ -0,0 +1,5 @@
+fn proc_pidpath(int, voidptr, int) int
+
+fn C.realpath(charptr, charptr) &char
+
+fn C.chmod(byteptr, int) int