Add additional check on EACCES on Linux when considering possible paths

EACCES can be something that comes back from execve() for reasons
related to permissions, or file type. Instead of failing due to the
underlying error, just continue to the next possible path.

Author: cmcgee1024

Sources/Subprocess/Platforms/Subprocess+Linux.swift

@@ -107,7 +107,7 @@ extension Configuration {
                 }
                 // Spawn error
                 if spawnError != 0 {
-                    if spawnError == ENOENT {
+                    if spawnError == ENOENT || spawnError == EACCES {
                         // Move on to another possible path
                         continue
                     }