[WIP] Joyent updated their SmartOS datasets, verify pkgsrc repo to determine d...

...ataset used and import correct manifest.xml

`http://wiki.joyent.com/wiki/display/jpc2/Available+Joyent+Public+Cloud+Machine+Images#AvailableJoyentPublicCloudMachineImages-GeneralPurposeSmartMachines`

If you use a SmartOS machine with `SmartOS`  dataset, you will end up with gcc46 with the path `/opt/local/lib/amd64/libgcc_s.so.1`

If you use a SmartOS machine with `Base` or `Standard`, you will end up with gcc47 with the path `/opt/local/lib/amd64/libgcc_s.so.1`

Even if you use an old dataset and change yourself the pkgin repo to point to latest Joyent one, you will end up with gcc47 in the path.

Also, `whoami` moved from `ucb` path to `/opt/local/gnu/bin/`.