scripts: prereqs: Add xxd to the prereq list

Needed after https://spacebeaker-review.googlesource.com/c/shodan/sw/vec-iree/+/15200

Change-Id: I19e0479657fcef59eb51318cb1ed8950cf86bb56

install-prereqs.sh

diff --git a/install-prereqs.sh b/install-prereqs.sh
index 310957e..c29d8c5 100755
--- a/install-prereqs.sh
+++ b/install-prereqs.sh
@@ -86,6 +86,7 @@
     policykit-1
     screen
     wget
+    xxd
     zlib1g
     zlib1g-dev
 )