ci: Put ASAN CFLAGS in one place

[kazarmy]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository
• I made sure to follow the project's coding style
• I've documented or updated the documentation of every function and struct this PR changes. If not so I've explained why.
• I've added tests that prove my fix is effective or that my feature works (if possible)
• I've updated the rizin book with the relevant information (if needed)

Detailed description

This pr just puts the ASAN CFLAGS in one place to make it easier to copy-and-paste them.

Test plan

All builds are green.

Closing issues

...

[Rot127]

We could also try and add UBSAN at some point.

[kazarmy]

rizin/.github/workflows/ci.yml

Line 114 in 708e30d

meson_options: -Dbuildtype=debugoptimized -Db_lundef=false -Db_sanitize=address,undefined --werror

-Db_sanitize=address,undefined does include UBSAN if I'm not mistaken.