Improve GCC builds

[ktf]

• Move to GCC 13.2.0
• Move to GDB 14.2
• Do not use GCC 7.3.0 as default, since now AliRoot it's built with its own default.
• Add support for CCACHE. While disabled by default it can be enabled by passing CCACHE_DISABLE=false as environment variable.

[awegrzyn]

@ktf Very nice, do you have any numbers/experience on speed up when using Ccache with our codebase?

[ktf]

No... In the past (15+ years ago) I frankly spent more time chasing hash conflicts than saved build time, but maybe it is worth giving another chance since a lot of time passed. Moreover they now provide distributed caches via redis as well, which might be very interesting if it works as advertised.

[ktf]

The other issue is root dictionaries generation which cannot be cached. i propose we simply try and then decide how to proceed.

[awegrzyn]

Ok thanks. Yeah, I'm keen on experiment with it as well.

[ktf]

Closed in favor of #5449 which has the minimal set required.