vim: fix indenting enums and macros

Now vim indenting goes from:

fn main() {
    enum t {
a: int,
   b: int
    }
#error("hello world");
}

to:

fn main() {
    enum t {
        a: int,
        b: int
    }
    #error("hello world");
}

src/etc/vim/indent/rust.vim

@@ -5,5 +5,6 @@ if exists("b:did_indent")
 endif
 
 let b:did_indent = 1
-
 setlocal cindent
+setlocal cinkeys-=0#
+setlocal cino=j1,J1