insane.bbclass: remove leftover variables and comment

The code that used these variable and the comment was introduced in
commit b44d32ef41 ("insane.bbclass: Portions of code were not running,
fix this and sync with OE.dev. Also add tests for bad sysroot rpaths in
binaries"). Later, in commit 17dae13fabe2 ("insane.bbclass: Fix ELF
bitsize comparison"), some of that code was removed again, but not the
variables and the comment.

(From OE-Core rev: c00a9a8f25b0042b0723a5d20b88e92d473d22bf)

Signed-off-by: Emil Kronborg <emil.kronborg@protonmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
(cherry picked from commit 730d00b0d1d1d617b62900be12fa034bb41fc48b)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/classes-global/insane.bbclass

@@ -835,10 +835,6 @@ def prepopulate_objdump_p(elf, d):
 
 # Walk over all files in a directory and call func
 def package_qa_walk(warnfuncs, errorfuncs, package, d):
-    #if this will throw an exception, then fix the dict above
-    target_os   = d.getVar('HOST_OS')
-    target_arch = d.getVar('HOST_ARCH')
-
     warnings = {}
     errors = {}
     elves = {}