Fixed compilation error with recent CFITSIO versions

This is a minor release consisting of a single bug fix. Recent versions of the CFITSIO library have added a dependency on CURL to be able to read file through an HTTPS connection. While this feature is absolutely not needed for EGG, it is still enabled by default on most distributions and will prevent the code from compiling if this new dependency on CURL is not taken into account. This release fixes this problem.