Consolidate relibc overlay patch chain

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

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

recipes/core/relibc/recipe.toml

@@ -3,7 +3,6 @@ git = "https://gitlab.redox-os.org/redox-os/relibc.git"
 patches = [
     "../../../local/patches/relibc/redox.patch",
     "../../../local/patches/relibc/P0-strtold-cpp-linkage-and-compat.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",