Removed ci/compat.sh as it is included in build.zig again

ci/compat.sh

@@ -1,25 +0,0 @@
-#!/bin/bash
-# This script checks that `zig build` will return a useful error message when
-# the Zig compiler is not compatible, instead of failing due to a syntax error.
-#
-# This script should be run on an UNIX system.
-
-zig_version=$(zig version)
-
-zig build -Dn=1 -Dhealed &> /dev/null 2>&1
-zig_ret=$?
-
-if [ "$zig_ret" -eq 0 ]; then
-    printf "zig %s unexpectedly succeeded\n" "$zig_version"
-    exit 1
-fi
-
-zig_error=$(zig build -Dn=1 -Dhealed 2>&1)
-
-echo "$zig_error" | grep -q "it looks like your version of zig is too old"
-zig_ret=$?
-
-if [ "$zig_ret" -ne 0 ]; then
-    printf "zig %s is not compatible\n" "$zig_version"
-    exit 1
-fi