List of problems fixed in this release:

<https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=5.4>

We had some problems compiling the 5.4.0 release [1] with
glibc 2.23, so use latest revision on the 5.4 branch, where
all these problemes were already fixed.

[1] #502

gcc-7 changes: <https://gcc.gnu.org/gcc-7/changes.html>
gcc-6 changes: <https://gcc.gnu.org/gcc-6/changes.html>

Several packages depend on libgfortran.so.3 provided by
gcc-5.3.

Examples of packages:

    - julia-0.6.0-0.x86_64
    - arpack-3.1.5-0.x86_64
    - lapack-3.5.0-1.x86_64
    - openblas-0.2.19-0.x86_64
    - numpy_python2.6-1.7.0b2-0.x86_64
    - numpy-1.10.4-0.x86_64
    - scipy_python3.3-0.11.0-0.x86_64

Provide libgfortran.so.3 from gcc-5.3.0-0.