Fix cross compilation suffix detection

If the path involves `-`, this would have otherwise detected this as a cross compile suffix.

c_check

@@ -30,7 +30,7 @@ if ($ARGV[0] =~ /(.*)(-[.\d]+)/) {
 	$cross_suffix = $1;
     }
 } else {
-    if ($ARGV[0] =~ /(.*-)(.*)/) {
+    if ($ARGV[0] =~ /([^\/]*-)([^\/]*$)/) {
 	$cross_suffix = $1;
     }
 }