Add custom i686 target

targets/i686-unknown-redox.json

@@ -0,0 +1,49 @@
+{
+  "arch": "x86",
+  "cpu": "pentiumpro",
+  "crt-objects-fallback": "false",
+  "crt-static-allows-dylibs": true,
+  "crt-static-default": true,
+  "crt-static-respected": true,
+  "data-layout": "e-m:e-p:32:32-p270:32:32-p271:32:32-p272:64:64-i128:128-f64:32:64-f80:32-n8:16:32-S128",
+  "dynamic-linking": true,
+  "env": "relibc",
+  "has-rpath": true,
+  "has-thread-local": true,
+  "late-link-args": {
+    "gnu-cc": [
+      "-lgcc"
+    ],
+    "gnu-lld-cc": [
+      "-lgcc"
+    ]
+  },
+  "linker-flavor": "gnu-cc",
+  "llvm-target": "i686-unknown-redox",
+  "max-atomic-width": 64,
+  "metadata": {
+    "description": null,
+    "host_tools": null,
+    "std": null,
+    "tier": null
+  },
+  "os": "redox",
+  "plt-by-default": false,
+  "position-independent-executables": true,
+  "pre-link-args": {
+    "gnu-cc": [
+      "-m32"
+    ],
+    "gnu-lld-cc": [
+      "-m32"
+    ]
+  },
+  "relro-level": "full",
+  "stack-probes": {
+    "kind": "call"
+  },
+  "target-family": [
+    "unix"
+  ],
+  "target-pointer-width": 32
+}