Remove cast to KotlinJvmTarget for all targets of type jvm

[AmrAfifiy]

The new android multiplatform plugin will have type jvm but doesn't inherit from the KotlinJvmTarget type, which makes the compose multiplatform gradle plugin not useable with the new android gradle plugin for multiplatforms builds.

[m-sasha]

Thanks for the PR, we'll look at it.

[AlexeyTsvetkov]

@AmrAfifiy do you have an example, where the issue could be reproduced? Generally LGTM, but I would like to add a test. I'm read to write the test myself, but I would like to clarify, what:

makes the compose multiplatform gradle plugin not useable with the new android gradle plugin for multiplatforms builds.

means

[jamesward]

Here is a fairly small reproducer: https://github.com/jamesward/hello-android/tree/compose-multiplatform

[AlexeyTsvetkov]

@jamesward thanks for the reproducer!

I have checked the fix locally. The test will be added as a separate PR.

@AmrAfifiy thanks for the contribution!