Use uname -m instead of uname -i

-i (and -p) just say "unknown", since Fedora 38. See [1] and [2] for
the original commit and more details. Kudos to awilliam@redhat.com for
fixing this in Fedora tests first.

* [1] https://src.fedoraproject.org/rpms/binutils/c/78d9a63f8ba7e445010ac35ef6620676c33fc645?branch=rawhide
* [2] https://bugzilla.redhat.com/show_bug.cgi?id=2203350

tests/dts-probe-binaries/test.sh

@@ -122,7 +122,7 @@ rlJournalStart
     ./popcnt > a
     rlRun "$ADDR2LINE -e popcnt $(cat a) > r"
     # We know that main is at line 4.  But on PPC we get ??:0...
-if test ! $(uname -i) = "ppc64"; then
+if test ! $(uname -m) = "ppc64"; then
     rlAssertGrep "popcnt.c:4" r
 fi
     rm -vf [ra]
@@ -205,7 +205,7 @@ fi
     fi
     # Try -P --size-sort.
     rlRun "nm -P --size-sort localplt > p"
-if test $(uname -i) = "ppc64" -a $(rlGetDistroRelease) -gt 5; then
+if test $(uname -m) = "ppc64" -a $(rlGetDistroRelease) -gt 5; then
     rlAssertGrep "__libc_csu_init D" p
     rlAssertGrep "main D" p
 else