addpatch: rio

- Fix broken rust target.
- Workaround rustc bug: rust-lang/rust#110224

Author: kxxt

rio/riscv64.patch

@@ -0,0 +1,12 @@
+--- PKGBUILD
++++ PKGBUILD
+@@ -25,7 +25,8 @@ sha512sums=('3b3fd074d8f5fb90dc9f8c6922431facf873181bdc030f696bd6f6018bf0439f8d3
+ 
+ prepare() {
+   cd "${pkgbase}-${pkgver}"
+-  cargo fetch --locked --target "${CARCH}-unknown-linux-gnu"
++  sed -i '/^split-debuginfo\s*=\s*"unpacked"/d' Cargo.toml
++  cargo fetch --locked
+ }
+ 
+ build() {