Backport upstream extstore test improvements

This should let our `riscv64` builds *actually* pass!

This also update our previous backport to be backporting the actual merged upstream commit (which is identical to my previous, but against the proper development branch).

Author: tianon

1/alpine/Dockerfile

@@ -82,11 +82,19 @@ RUN set -eux; \
 {{ if .version == "1.6.38" then ( -}}
 # https://github.com/memcached/memcached/issues/1220
 # https://github.com/memcached/memcached/pull/1221
-	wget -O memcached-time-overflow.patch 'https://github.com/tianon/memcached/commit/8d4e02984661a3a26decc5a45d62a9eeaaf72986.patch?full_index=1'; \
-	echo '59f068d1fe4819ec65ec8c7adc8c5ecf8a7753ba5c6e5a17e5ba42c9946074a2 *memcached-time-overflow.patch' | sha256sum -c -; \
+# https://github.com/memcached/memcached/commit/1a0a0b2591176a7c82412e27f3e17ba9133cd8dd
+	wget -O memcached-time-overflow.patch 'https://github.com/memcached/memcached/commit/1a0a0b2591176a7c82412e27f3e17ba9133cd8dd.patch?full_index=1'; \
+	echo '12441b94e0c35e2bd4511d10b799b731f3aae7428f196d34eccefb68351ed0f0 *memcached-time-overflow.patch' | sha256sum -c -; \
 	patch --input="$PWD/memcached-time-overflow.patch" --strip=1 --directory=/usr/src/memcached; \
 	rm memcached-time-overflow.patch; \
 	\
+# https://github.com/memcached/memcached/issues/1220#issuecomment-2762952480
+# https://github.com/memcached/memcached/commit/a2e47b5afdf6ad7deeb54ce9fb1d45cf8cfd1024
+	wget -O memcached-extstore-test-stability.patch 'https://github.com/memcached/memcached/commit/a2e47b5afdf6ad7deeb54ce9fb1d45cf8cfd1024.patch?full_index=1'; \
+	echo 'a421465488e2ffac5fe3d956598f030f5b06399af3dbb4e36ecebdd368245b4b *memcached-extstore-test-stability.patch' | sha256sum -c -; \
+	patch --input="$PWD/memcached-extstore-test-stability.patch" --strip=1 --directory=/usr/src/memcached; \
+	rm memcached-extstore-test-stability.patch; \
+	\
 {{ ) else "" end -}}
 	cd /usr/src/memcached; \
 	\