Add --compiler argument to g-ir-scanner

We currently use the `CC` environment variable to find the C compiler to
use internally in g-ir-scanner. Build systems might wish to store the
compiler detected during the build configuration, and then pass that
compiler to g-ir-scanner at the time of build, avoiding to put things
into the environment.

One possible solution is to have a command line argument that lets us
specify the C compiler, with the same semantics as the `CC` environment
variable.

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