[physfs] 2.0.2 Documentation

[Adrián Chaves Fernández]

Hi,

I run this on latest release:

> mkdir build && cd build
> cmake \
>   -DCMAKE_INSTALL_PREFIX=/usr \
>   -DCMAKE_BUILD_TYPE=RelWithDebInfo \
>   ..
> make docs

And I got this:

> Scanning dependencies of target docs
> [  0%] Building documentation                                                                                                                               
> Doxyfile not found and no input file specified!                                                                                                             
> Doxygen version 1.6.3

Is that normal? `make` works great, but I get no documentation with it, and I 
would prefer to package it with docs.