Bump extern/riscv-bitmanip with zip/unzip fixes.

ben-marshall · ben-marshall · commit b5a968d37091 · 2021-10-06T14:09:55.000+01:00
- Encodings were correct but the descriptions and pseudo-code still
  were not. This commit fixes them.

 On branch master
 Your branch is up-to-date with 'origin/master'.

 Changes to be committed:
	modified:   extern/riscv-bitmanip
diff --git a/extern/riscv-bitmanip b/extern/riscv-bitmanip
@@ -1 +1 @@
-Subproject commit e2ce555fb5d75b7530900214a04e64bc234de390
+Subproject commit 5adeeec6d5965e4c79c14e07cf9c1e26716daf08
