build: meson support for openpower-pel extensions

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I4b45f71a3de4966fe3649480d4333806f201f405
diff --git a/subprojects/CLI11.wrap b/subprojects/CLI11.wrap
new file mode 100644
index 0000000..e695a9d
--- /dev/null
+++ b/subprojects/CLI11.wrap
@@ -0,0 +1,3 @@
+[wrap-git]
+url = https://github.com/CLIUtils/CLI11.git
+revision = HEAD