Use prefix when installing deps

[pnu]

--prefix options doesn't get pased to the install for deps. For normal install it works correctly.

Before:

$ rm -rf here; mkdir here
$ panda --prefix="inst#here" installdeps .
==> Test depends on Acme::Meow
==> Fetching Acme::Meow
==> Building Acme::Meow
==> Testing Acme::Meow
t/00-load.t .. ok
t/01-fun.t ... ok
All tests successful.
Files=2, Tests=7,  2 wallclock secs ( 0.02 usr  0.00 sys +  1.98 cusr  0.13 csys =  2.13 CPU)
Result: PASS
==> Installing Acme::Meow
==> Successfully installed Acme::Meow
$ tree here
here
└── panda
    ├── projects.json
    └── state

1 directory, 2 files

After:

$ rm -rf here; mkdir here
$ panda --prefix="inst#here" installdeps .
==> Test depends on Acme::Meow
==> Fetching Acme::Meow
==> Building Acme::Meow
==> Testing Acme::Meow
t/00-load.t .. ok
t/01-fun.t ... ok
All tests successful.
Files=2, Tests=7,  2 wallclock secs ( 0.02 usr  0.00 sys +  2.03 cusr  0.14 csys =  2.19 CPU)
Result: PASS
==> Installing Acme::Meow
==> Successfully installed Acme::Meow
$ tree here
here
├── bin
├── dist
│   └── F15BE61835E63CD5C7103F80A8B92AF85AA9EA95
├── panda
│   ├── projects.json
│   └── state
├── repo.lock
├── resources
├── short
│   └── 7EECB474A4B076F9ADC69FA64009364FC2824DBE
└── sources
    └── 4E9BDFC55D26E09C9E7088F6F534B7FBB9028A51

6 directories, 6 files