Consolidate relibc overlay patch chain

Keep the relibc compatibility work in tracked local patch carriers and align the recipe with the full durable patch stack so clean reapply and rebuild paths stay reproducible.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

recipes/core/relibc/recipe.toml

@@ -1,6 +1,21 @@
 [source]
 git = "https://gitlab.redox-os.org/redox-os/relibc.git"
-patches = ["redox.patch"]
+patches = [
+    "../../../local/patches/relibc/redox.patch",
+    "../../../local/patches/relibc/P3-eventfd.patch",
+    "../../../local/patches/relibc/P3-signalfd.patch",
+    "../../../local/patches/relibc/P3-signalfd-header.patch",
+    "../../../local/patches/relibc/P3-timerfd.patch",
+    "../../../local/patches/relibc/P3-open-memstream.patch",
+    "../../../local/patches/relibc/P3-socket-flags.patch",
+    "../../../local/patches/relibc/P3-ifaddrs-net_if.patch",
+    "../../../local/patches/relibc/P3-waitid.patch",
+    "../../../local/patches/relibc/P3-waitid-header.patch",
+    "../../../local/patches/relibc/P3-sysv-ipc.patch",
+    "../../../local/patches/relibc/P3-sysv-sem-impl.patch",
+    "../../../local/patches/relibc/P3-sysv-shm-impl.patch",
+    "../../../local/patches/relibc/P3-ipc-tests.patch",
+]
 
 [build]
 template = "custom"