ragel: Add -std=gnu++98 to CXXFLAGS.

[tpikonen]

On my (linux, IA32) system mason build of ragel-6.9 fails with -Wnarrowing, due to use of -std=c++11. This patch adds -std=gnu++98 to CXXFLAGS, which is enough to make the compiler not to turn this warning into an error.

There is probably a cleaner way to fix this though.

[springmeyer]

The problem is that mason hardcodes std=c++11. So I recommend trying out this fix to remove it:

export CXXFLAGS="${CXXFLAGS//-std=c++11}"

Does that alone work or do you really also need -std=gnu++98. I presume -std=gnu++98 does not need to be added.

[tpikonen]

No, just removing -std=c++11 does not work. This does:

export CXXFLAGS="${CXXFLAGS//-std=c++11} -std=c++03"

(or using -std=gnu++98 as in the original PR).