commit a test (which mksh on MirOS BSD currently fails) to test if files

starting with an UTF-8 BOM before the shebang can be executed correctly;
this would succeed if either mksh parses the shebang line instead of re-
lying on $EXECSHELL or the kernel supports it

bsiegert@ ok's my attempts to fix this

check.t

@@ -1,4 +1,4 @@
-# $MirOS: src/bin/mksh/check.t,v 1.95 2007/04/15 10:45:58 tg Exp $
+# $MirOS: src/bin/mksh/check.t,v 1.96 2007/04/15 10:58:55 tg Exp $
 # $OpenBSD: bksl-nl.t,v 1.2 2001/01/28 23:04:56 niklas Exp $
 # $OpenBSD: history.t,v 1.5 2001/01/28 23:04:56 niklas Exp $
 # $OpenBSD: read.t,v 1.3 2003/03/10 03:48:16 david Exp $
@@ -3928,3 +3928,26 @@ expected-stdout:
 	ohne
 	: mit
 ---
+name: utf8bom-2
+description:
+	Check that we can execute BOM-shebangs
+category: pdksh
+env-setup: !FOO=BAR!
+stdin:
+	print '#!'"$0"'\nprint "a=$ENV{FOO}";' >t1
+	print '#!'"$0"'\nprint "a=$ENV{FOO}";' >t2
+	print '#!/usr/bin/env perl\nprint "a=$ENV{FOO}\n";' >t3
+	print '#!/usr/bin/env perl\nprint "a=$ENV{FOO}\n";' >t4
+	chmod +x t?
+	EXECSHELL=$0
+	export EXECSHELL
+	./t1
+	./t2
+	./t3
+	./t4
+expected-stdout:
+	a=/nonexistant{FOO}
+	a=/nonexistant{FOO}
+	a=BAR
+	a=BAR
+---