test-many-klibcs: Fix emulation of ppc SPE binaries

We need to set an environment variable to make QEMU do the right
thing.
diff --git a/test-many-klibcs b/test-many-klibcs
index e29abd9..7d7c83f 100755
--- a/test-many-klibcs
+++ b/test-many-klibcs
@@ -77,7 +77,7 @@
 	    sudo chroot "$useropt" -- install "$@"
 	    ;;
 	*)
-	    sudo chroot "$useropt" -- install "/bin/qemu-$qemuarch-static" -- \
+	    sudo ${QEMU_CPU:+QEMU_CPU=$QEMU_CPU} chroot "$useropt" -- install "/bin/qemu-$qemuarch-static" -- \
 		 "$@"
 	    ;;
     esac
@@ -192,6 +192,16 @@
     qemuarch="$4"
     makeflags="${5:-}"
 
+    case "$qemuarch" in
+	*:*)
+	    export QEMU_CPU="${qemuarch#*:}"
+	    qemuarch="${qemuarch%:*}"
+	    ;;
+	*)
+	    unset QEMU_CPU
+	    ;;
+    esac
+
     echo "I: Architecture $arch/$gnuarch: begin"
     if clean && build && do_install && run_tests; then
 	echo "I: Architecture $arch/$gnuarch: pass"
@@ -230,7 +240,7 @@
 process mips64  mips    mips64el-linux-gnuabi64 mips64el
 process parisc  parisc  hppa-linux-gnu          hppa
 process ppc     powerpc powerpc-linux-gnu       ppc
-process ppc     powerpc powerpc-linux-gnuspe    ppc
+process ppc     powerpc powerpc-linux-gnuspe    ppc:e500v2
 process ppc64   powerpc powerpc64-linux-gnu     ppc64
 process ppc64   powerpc powerpc64le-linux-gnu   ppc64le
 process riscv64 riscv   riscv64-linux-gnu       riscv64