removing local netpbm binaries and libraries

[onlyjob]

Please consider to remove redundant binary executables and libraries from "netpbm" package.
For some reasons binaries are referenced in https://github.com/gigablast/open-source-search-engine/blob/master/Process.cpp#L161

It is the best to avoid committing prebuilt binaries to the repository. Thanks.

[onlyjob]

Of several "netpbm" binaries, bmptopnm, pngtopnm, tifftopnm and giftopnm are used only in Process.cpp to ensure their presence in gb's data(!) folder. This is unconventional and PATH should work just fine.

Only the following are actually used:

• ppmtojpeg
• pnmscale
• jpegtopnm

IMHO it should be safe to remove all those utilities from the repository and especially from Process.cpp so admins could use newer (updateable) package from the Operating System.