Build fails on recent G++

[smondet]

I get a bunch of errors like:

Fasta.cpp:23:109: error: conditional expression between distinct pointer types ‘gzFile’ and ‘FILE* {aka _IO_FILE*}’ lacks a cast
 #define READ_STREAM              (mAreBasesCompressed ? mInZStream                                        : mInStream)

with:

 $ g++ --version
g++ (GCC) 4.8.5 20150623 (Red Hat 4.8.5-4)
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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