gcc: re-add version suffix.

Revert "gcc: don't configure with version suffix."

This reverts commit 88fd6aab011068138140e0578a2a5c208cf69f2b.
gcc: update 4.8.3_1 bottle.

Closes #29943.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
added MPI support for fftw

Closes #29949.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
sundials: move to homebrew-science
cantera: move to homebrew-science
gromacs: move to homebrew-science

Closes #29880.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>