Arch: DXVK - ignore non-existent patch files

arch/0-dxvk-git/PKGBUILD

@@ -54,7 +54,9 @@ prepare() {
   msg2 "Applying custom patches..."
 
     for i in "${srcdir}"/*.{patch,diff}; do 
-      patch -Np1 < ${i}
+      if [[ -f ${i} ]]; then
+        patch -Np1 < ${i}
+      fi
     done
 
   fi