luajit2: update test-version.sh to actual test

old just disabled version test, but as LuaJIt 2.1. part is stable.
So we can use that for test if luajit2 itself able to run.

Fixes: c7ca6d46f7 luajit2: ("add test-version.sh")
Suggested-by: Josef Schlehofer <pepe.schlehofer@gmail.com>

Signed-off-by: Seo Suchan <tjtncks@gmail.com>

lang/lua/luajit2/test-version.sh

@@ -4,9 +4,8 @@
 
 case "$PKG_NAME" in #luajit2 use build number at -v but releases are named by date
 luajit2)
-	exit 0
+	luajit2 -v 2>&1 | grep -F "LuaJIT 2.1."
 	;;
-
 *)
 	echo "Untested package: $PKG_NAME" >&2
 	exit 1