all: update to LLVM 14

Switch over to LLVM 14 for static builds. Keep using LLVM 13 for regular
builds for now.

This uses a branch of the upstream Espressif branch to fix an issue,
see: https://github.com/espressif/llvm-project/pull/59

targets/nintendoswitch.json

@@ -1,7 +1,7 @@
 {
   "llvm-target": "aarch64",
   "cpu": "cortex-a57",
-  "features": "+aes,+crc,+crypto,+fp-armv8,+neon,+sha2",
+  "features": "+aes,+crc,+crypto,+fp-armv8,+neon,+sha2,+v8a",
   "build-tags": ["nintendoswitch", "arm64"],
   "scheduler": "tasks",
   "goos": "linux",