rust-target-config.bbclass: move target generation before do_configure

The rust_get_targets task from the rust-target-config class generates some
Rust compiler configurations for different the target and host machine, which
is used by Rust during compiling a recipe. These configurations supposed to
be available by the time the Rust compiler is used for the first time.

By default, this task is executed "before do_compile" - it assumes that
this is the first task that would use this configuration.

However this is not always the case, especially with projects which are not
pure Cargo projects, rather Cargo/Rust is called by a different build system.
As an example librsvg uses meson, and during the do_configure step Meson probes
the Rust compiler, trying to gather some library info from Rust. In case the
rust_gen_targets task was executed before the do_configure task, then
everything works. However this is not always the case - sometimes the job is
executed between the configure and compile steps, in which case the configuration
fails.

To avoid such problems, generate these targets before the do_configure step.

(From OE-Core rev: 1d3c02553122982daedfe32c6ce09fac9e091952)

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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