[3.15] gh-152769: fixup enabling of perf trampoline on musl (Alpine Linux) (#153995)

Co-authored-by: Victor Stinner <vstinner@python.org>

Author: jjhelmus

configure

@@ -3873,8 +3873,8 @@ AC_MSG_CHECKING([perf trampoline])
 AS_CASE([$PLATFORM_TRIPLET],
   [x86_64-linux-gnu], [perf_trampoline=yes],
   [aarch64-linux-gnu], [perf_trampoline=yes],
-  [x86_64-linux-gnu], [perf_trampoline=yes],
   [x86_64-linux-musl], [perf_trampoline=yes],
+  [aarch64-linux-musl], [perf_trampoline=yes],
   [darwin], [AS_CASE([$MACOSX_DEPLOYMENT_TARGET],
                 [[10.[0-9]|10.1[0-1]]], [perf_trampoline=no],
                 [perf_trampoline=yes]