Consider emitting build IDs by default

[umanwizard]

If you pass --enable-linker-build-id to GCC's configure script, the resulting GCC will automatically add the NT_GNU_BUILD_ID note to compiled binaries.

This is required by various tools (debuggers, profilers, etc.) and is already the default for the gcc distributed with popular Linux distros like Debian, Fedora and Ubuntu. Thus, it can be confusing for users that it is missing on the versions of GCC installed via this tap.

[messense]

I think this is done in #46 by setting CT_CC_GCC_BUILD_ID=y.