KOBAYASHI Shuji df437eebcc Fix mruby --verbose (regression by #4827) ...

#### Before this patch:

  ```
  $ bin/mruby --verbose -e 'p 1'
  bin/mruby: Cannot open program file: --verbose
  ```

#### After this patch:

  ```
  $ bin/mruby --verbose -e 'p 1'
  00001 NODE_SCOPE:
  (snip)
  irep 0x7fe97041df30 nregs=4 nlocals=1 pools=0 syms=1 reps=0 iseq=11
  file: -e
      1 000 OP_LOADSELF R1
  (snip)

  1
  ```

2019-11-29 19:02:04 +09:00

..

mruby.c

Fix mruby --verbose (regression by #4827)

2019-11-29 19:02:04 +09:00