This is the official scons way to check for things on the system. This
adds two custom checks, one for java packages and one for pkg-config
packages. This change also adds a check for the org.junit java package
which is/will be used for a test for the java wrapper.
Change-Id: I59ca559f257a4c671e9b72a50b5635b5eb61ee69
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/28180
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Gabe Black <gabe.black@gmail.com>
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