[PATCH v2 12/23] contrib/buildsystems: error out on unknown option

["Johannes Schindelin via GitGitGadget" <gitgitgadget@xxxxxxxxx>]

From: Johannes Schindelin <johannes.schindelin@xxxxxx>

One time too many did this developer call the `generate` script passing
a `--make-out=<PATH>` option that was happily ignored (because there
should be a space, not an equal sign, between `--make-out` and the
path).

And one time too many, this script not only ignored it but did not even
complain. Let's fix that.

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
 contrib/buildsystems/engine.pl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/contrib/buildsystems/engine.pl b/contrib/buildsystems/engine.pl
index 732239d817..1a12f4d556 100755
--- a/contrib/buildsystems/engine.pl
+++ b/contrib/buildsystems/engine.pl
@@ -57,6 +57,8 @@ sub showUsage
         open(F, "<$infile") || die "Couldn't open file $infile";
         @makedry = <F>;
         close(F);
+    } else {
+        die "Unknown option: " . $arg;
     }
 }
 
-- 
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