Fix build directory creation in rebuild target #68
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The rebuild target was only creating the app directory, causing compilation failures when building after 'make clean'. The compiler needs kernel and lib directories to exist before it can write dependency files during object compilation. Without these directories, the build process fails with file system errors when attempting to create .d files in non-existent paths.
The rebuild target now creates all three required build directories (app, kernel, and lib) to ensure the build environment is properly initialized before compilation begins.
Summary by cubic
Fix rebuild target to create app, kernel, and lib build directories to avoid failures after make clean. Ensures dependency .d files can be generated without filesystem errors.
Written for commit 29e95d4. Summary will update on new commits.