package/gcc: drop leftovers from PowerPC conditional patching

package/gcc: drop leftovers from PowerPC conditional patching

We used to have a conditional patch applied on PowerPC soft-float, but
this logic was dropped in commit
0c82f3f63563c4d4d7e034d0e9e4ceb766d92322 ("package/gcc: remove powerpc
conditional patching logic"). However, we still have some related
leftovers in the calculation of the hashes for ccache, which can now
be dropped.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Romain Naour <romain.naour@gmail.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Acked-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>